In the collecting world, if the upper part of the letter 'bu' (分) of 'nibu' (二分) which was engraved on the surface of the coin did not end with a upward brushstroke ('tomebu'), it was considered to be a Meiji nibukin and if it did end with an upward brushstroke ('hanebu'), it was considered to be a Manen nibukin.
収集界ではこれまで、表面の「二分」の「分」字の「止め分」を明治二分金、「撥ね分」を万延二分金としてきた。