Rounded
Roughly 21 x 12 mm, 7.53 g
Short, angled strokes on top of 常 character, no file marks on the sides
Top three strokes on 常 character are long, a few file marks on the sides
It doesn't match either of these
There are many intermediate pieces that don't clearly fit into either category. These are "Intermediate Ko Nanryo," and it's uncertain when they were struck. Most places - including PCGS - group all forms of Ko Nanryo together, so it doesn't have much impact.
The top three strokes are short and angled
The top three strokes are long and parallel
Two - this one as well
You have a Tenpo, Ansei, or Meiji ichibu. Which one is determined by inverted sakura around the border. There are thorough descriptions on how to ID these three types in most guides, so I'm not going into much detail for now. If you're having trouble attributing one, feel free to reach out, or see page 128 in Early Japanese Coins by David Hartill. I have simplified it as much as possible below to help show the patterns and enable you to make an educated guess without always referring to a table.
T = Tenpo Ichibu
A = Ansei Ichibu
M = Meiji Ichibu
The Rectangle Coins
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