Calling all Nambu/Japanese experts...

[siegersallee]

I have seen a Nambu that has a mark "12 12".
Is this some kind of dating algorithm?

I know that the Japanese date some of their stuff according to the the "Koki" calendar.

For example, the A6M Type 0 IJN fighter is called such because it was accepted into service in the year 2600 of the "Koki" calendar.

The "Koki" calendar is based upon the ascendency of the first Japanese emperor in 660 BC which equates to year 1 of the "Koki" calendar.

They also used a dating system that was based upon the reign of a particular emperor. For example, Hirohito became emperor in 1926 and his reign was called "Showa". The dating system based upon the "Showa" calendar would be 1926 = year 1.

Very confusing, eh...

Anyway, even with all this info, I do not understand the "12 12"
marking on this Nambu. If anyone can shed light on this, that would be great.

Richard