Keicho Kobans with fine straw matt mark were casted in the early period and the ones made coarsely and uniformly resembling Genroku Koban (oval coin) were thought to be cast in the late period, after the Great Fire of Meireki, and during about 95 years of issuance of Keicho Koban, it was presumed that it was cast in large number in the eary period, but became less in the late period according to the declining volume of gold production, and actually now more Keicho Koban in the late period remain.
茣蓙目の細かいものは前期、粗目で均質な製作となった元禄小判に類似するものは明暦の大火以降に鋳造されたと推定され後期鋳とされるが、約95年に亘る発行とはいえ初期に多量に鋳造され、その後産金の減少に伴い鋳造が衰退したと推定されることもあり、現実に後期のほうが現存数は少ない。