D3A2 Val 6474 Wing Access Panel
Kanji reads: "Aichi Type 99 Model 22 6474 Left"
Jim Lansdale adds:
"A late production Val 22 after Aichi switched s/n coding to this system (1xx0, 2xx8, 3xx7, 4xx8, 5xx5, 6xx4, 7xx3, 8xx2, 9xx1) or it is a Showa-constructed Val. This is an AICHI Val Model 22, constructed after the system changed from 3xxx to the later system where the first digit and the fourth digit was eithe 1xx0 or could be added to to yield 10."
Jim Long adds:
"This plane was one of 52 D3A2s assembled by Aichi during October 1943. The manufacture number tells us that it was the 474th D3A2 assembled by the company. The numeral 6 at the left of the M/N tells us that Aichi had switched to their version of the ten-cycle coding system for creating manufacture numbers during October 1943 With this evidence I can zero in on the possible date on which Aichi switched from the 3000 base number to the ten-cycle system of encoding the manufacture numbers. It seems that happened during the last ten days of October 1943. I'll be able to confirm the time period when I've studies the question a little more and have made a few calculations. I'll have to revise my tables, too."
Credit: Brian Bennett Date: 2003
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