To read years you should also know: 昭和 Shōwa (December 25, 1926, through January 7, 1989)
大正 Taishō (July 30, 1912 to December 25, 1926)
明治 Meiji (September 1868 through July 30, 1912)
For example, the picture below from a China Incident medal document says "Showa 15 Year (1940) 4 Month (April) 29 Day (29th)"
Sometimes the imperial year 皇紀 kōki was used rather than the emperor's reign.
This year is based on the founding of Japan by Emperor Jimmu. The 2600th anniversary medal issued in 1940 is going by this dating system. http://www.imperialjapanmedalsandbadges.com/2600th.html
It' was also used for a lot of military nomenclature in the 1930s-1940s, like the Type 99 rifle (Year 2599) and the "Zero" fighter (Year 2600).
The Type 30 bayonet and the Type 38 rifle on the other hand are based on the Meiji year.
The old kanji for numbers are still used today, especially when writing rank diplomas (2nd Rank, 3rd Rank) or checks/cheques. For instance, the number 弐 (2) cannot be falsified; whereas 二 (2) can be falsified to "3" with the addition of a single stroke: 二 plus一 equals三
For example, someone who has received a 2nd rank in kendo (kendo ni-dan) could -- if he has no scruples, change it to a 3rd rank IF the standard numerals were used:
剣道二段 [kendo 2nd rank] can be falsified to
剣道三段 [kendo, 3rd rank] with one expert stroke.
But when the old kanji are used, this forgery is impossible:
剣道弐段 [kendo 2nd rank] could not be manipulated to
剣道参段 [kendo 3rd rank]
In certificates, the number 1 is never used, always 初 [sho/initial] step:
剣道 初段 [kendo shodan]
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