The Rectangle Coins
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All B Dies

All die numbers have been assigned in an attempt to make a rough guess at likely striking order, but this is purely conjecture. While the A dies largely dictated the order, there's still a clear progression of calligraphy on B dies as well, going from fairly blunt, basic characters on B1 and B2 to more stylizied calligraphy with small end flourishes on B7 and B8.


The diagnostics described and pictured for each die highlight some of the smaller areas that may be helpful in distinguishing between two similar dies. The B dies are significantly more difficult to distinguish than A dies. Before looking at the small details, I encourage you to look at the connection between the top portion and the horizontal stroke of "ichi," and use this to narrow down your options. Is there a space between them, is the top connected near the middle, or is it connected to the left end? That alone will narrow it down to two or three dies.

Populations last updated April 1, 2025.

Character Terminology

This side includes two different characters, identified and labelled below to make discussion easier. In addition, it has a three layer border: an inner border of dots, a solid line, and an outer border of dots. Any time the dot border is referred to, it means the inner dots. The outer dots are typically cut off on multiple sides and aren't very useful as a diagnostic tool.

Gaku-B6 shown

Gaku-B1

Commentary

This is the only unique die among all examples studied. It's paired with Gaku-A1 (which is more often found with Gaku-B2), and this piece is the earliest die state of A1 that I've found (shown on the left here). 


I believe it's possible that this die pairing represents one of the first Gaku ichibu struck. As discussed under Gaku-A1, the unusual calligraphy leads me to believe it's the most likely candidate for the first A die, and since this is paired with an earlier die state of A1, I believe this may be among the first strikes. It's also worth noting that it's very well-centered compared to many other examples, suggesting a bit more care in its production, though more examples would be needed to draw any legitimate conclusions about strike quality, 

Stats

Total Found: 1/32 (3%)

Paired with:

  • Gaku-A1 (1/1)

Kirimon stamp on:

  • Side A (1/1)

B1 Diagnostics

Top Left Dot in Border

Ichi Top and Bottom Off-Center

Ichi Top and Bottom Off-Center

In the top left, the corner dot collides with the left solid border.

Ichi Top and Bottom Off-Center

Ichi Top and Bottom Off-Center

Ichi Top and Bottom Off-Center

The top portion of "ichi" is skewed to the left, and the bottom is to the right. These two elements are typically centered.

Stroke 3 Below 4

Ichi Top and Bottom Off-Center

Stroke 3 Below 4

The bottom edge of stroke 3 in "bu" is visibly lower than the end of stroke 4.

Gaku-B2

Commentary

The overall calligraphy style here is very similar to Gaku-B1, but small details make it clear that this is a different die. The dots in the border are generally very crowded with many of them overlapping, especially on the left side.

Stats

Total Found: 4/32 (12%)

Paired with:

  • Gaku-A1 (4/4)

Kirimon stamp on:

  • Side A (4/4)

B2 Diagnostics

Gap Between Characters

Smushed Bottom Right Dot

Gap Between Characters

There's a relatively large gap between "ichi" and "bu."

Blunt Stroke 1 End

Smushed Bottom Right Dot

Gap Between Characters

The left end of stroke 1 in "bu" is blunt with no curve.

Smushed Bottom Right Dot

Smushed Bottom Right Dot

Smushed Bottom Right Dot

The bottom right corner dot is smushed between the other dots.

Gaku-B3

Commentary

Every example I've seen with this die has been very mushy with textured fields. It seems to be larger than most dies and very little of the outer dot border is visible on these examples. While this is one of the easiest B dies to identify, it's also commonly not fully struck; every example above has at least one of the selected diagnostics too poorly struck to identify.

Stats

Total Found: 4/32 (12%)

Paired with:

  • Gaku-A2 (2/4)
  • Gaku-A3 (2/4)

Kirimon stamp on:

  • Side A (4/4)

B3 Diagnostics

Left Side of Ichi

Downward Bend on Stroke 2

Bottom of Ichi to Right

The top portion is connected to the left end of the horizontal stroke in "ichi," and this area touches the dot border.

Bottom of Ichi to Right

Downward Bend on Stroke 2

Bottom of Ichi to Right

The end of the bottom portion of "ichi" is very far to the right, near the end of the horizontal stroke if you were to draw a vertical line between them.

Downward Bend on Stroke 2

Downward Bend on Stroke 2

Downward Bend on Stroke 2

Stroke 2 of "bu" has a slight downward curve.

Gaku-B4

Commentary

This is probably one of the more distinctive B dies in overall calligraphy style. The top portion of "ichi" is very short and condensed compared to the other dies, and "bu" is very angular. The example on the right is graded MS62 by PCGS, suggesting that the amount of detail visible in the top portion of "ichi" may be all that was on the die to begin with. Most show much more detail and separation of strokes in this area.

Stats

Total Found: 2/32 (6%)

Paired with:

  • Gaku-A4 (2/2)

Kirimon stamp on:

  • Side A (2/2)

B4 Diagnostics

Top Disconnected from Ichi

Top Disconnected from Ichi

Top Disconnected from Ichi

The top portion is fully disconnected from the horizontal stroke in "ichi" with a large gap between the two.

Wide Horizontal Stroke

Top Disconnected from Ichi

Top Disconnected from Ichi

The horizontal stroke in "ichi" is very wide, almost touching the dot border on both ends..

Right Angle in Bu

Top Disconnected from Ichi

Right Angle in Bu

Stroke 3 of "bu" has a sharp right angle.

Gaku-B5

Commentary

This is one of the most difficult B dies to attribute. It has very few unique features. Even the three diagnostics pulled out aren't overly helpful; the first and third can be found on other dies, and the second is fairly ambiguous. This one is more a process of elimination to attribute.

Stats

Total Found: 2/32 (6%)

Paired with:

  • Gaku-A5 (2/2)

Kirimon stamp on:

  • Side A (1/2)
  • Side B (1/2)

B5 Diagnostics

Small Gap at Top of Ichi

Positioning of Bu Strokes

Small Gap at Top of Ichi

There's a small gap between the top portion and the horizontal line of "ichi."

Style of Bottom of Ichi

Positioning of Bu Strokes

Small Gap at Top of Ichi

The center line on the bottom part of "ichi" extends further to the right than normal.

Positioning of Bu Strokes

Positioning of Bu Strokes

Positioning of Bu Strokes

The bottom ends of stroke 1 and 2 in "bu" are in line.

Gaku-B6

Commentary

Similar to B5, this die has very few unique characteristics. The positioning of the strokes in "bu" is the key element to attribution - this is the only die I've seen where the ends are noticeably different, as described below.

Stats

Total Found: 4/32 (12%)

Paired with:

  • Gaku-A6 (4/4)

Kirimon stamp on:

  • Side A (4/4)

B6 Diagnostics

Top Connected Near Center

Large Flourish on Bu Stroke 1

Top Connected Near Center

The top portion is connected near the center of the horizontal stroke in "ichi."

Positioning of Bu Strokes

Large Flourish on Bu Stroke 1

Top Connected Near Center

The bottom ends of stroke 1 and 2 in "bu" are not in line; 1 ends significantly above 2.

Large Flourish on Bu Stroke 1

Large Flourish on Bu Stroke 1

Large Flourish on Bu Stroke 1

Stroke 1 of "bu" has a fairly large flourish at the end.

Gaku-B7

Commentary

When I was putting this page together, I discovered that I had actually misattributed a B7 die as B8 in my initial study. It was paired with A8, and all A8 pieces I'd found were paired with B8. The calligraphy was pretty similar, so I wrote down B8 and moved on. It wasn't until pulling out diagnostics that I realized it was actually A8 paired with B7. What I find most interesting is that the order wasn't changed by this discovery. I had already placed A7 and B7 as second to last in the series based on calligraphy style, and the pairing of A8 with B7 confirmed that these two die pairings were used in sequence. This is also one of very few examples of die overlap linking multiple A and B dies together.

Stats

Total Found: 5/32 (16%)

Paired with:

  • Gaku-A7 (4/5)
  • Gaku-A8 (1/5)

Kirimon stamp on:

  • Side A (3/5)
  • Side B (2/5)

B7 Diagnostics

Smushed Top Left Dot

Smushed Top Left Dot

Smushed Top Left Dot

The top left corner dot is very cut off and smushed into the border.

Slanted Ichi

Smushed Top Left Dot

Smushed Top Left Dot

The horizontal stroke of "ichi" is noticeably slanted.

Closed Bu

Smushed Top Left Dot

Closed Bu

The bottom of strokes 3 and 4 in "bu" meet, fully closing the bottom of the character.

Gaku-B8

Commentary

As with Gaku-A8, this is the most common B die. The size of the dots in the inner border is the most distinctive characteristic, as all other known B dies have much smaller dots.


The example on the right may show a re-engraving of the die on the left end of stroke 1 in "bu." Notice that on the other examples, this stroke touches the dot border, while the piece on the left seems to have a faint outline that touches the border and a more distinct stroke that doesn't. I haven't found any other examples match this, so I'm not sure if it's a re-engraving or just a strange strike.


Also note the kirimon stamp. On the left example above, you can see that there's a die break in the kirimon stamp where the incuse circle is broken (at 12 o'clock as struck). Of the ten examples, nine use this same kirimon stamp, and one uses a different stamp (or, perhaps, the same die before the break occurred).

Stats

Total Found: 10/32 (31%)

Paired with:

  • Gaku-A8 (10/10)

Kirimon stamp on:

  • Side A (7/10)
  • Side B (3/10)

B8 Diagnostics

Large Dots in Border

Large Dots in Border

Large Dots in Border

The dots in the border are much larger than on other dies, resulting in only nine dots across the top.

Dot by Ichi

Large Dots in Border

Large Dots in Border

There's a small dot near the right end of "ichi."

Dot by Bu

Large Dots in Border

Dot by Bu

There's a small dot to the right of "bu."

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