You're killin' me man!!! 1 - that you have so MANY Mantetsu!, and 2 - that you made me translate all those dates and numbers!!! HA! It was good practice, though.
So new developements:
We now have TWO consecutive numbers Ku 326 and Ku 327 in 1942 - we would hope to see that; and ALL 6 of our '44 numbers are 4-digit numbers. (thanks to DaveR, who pointed out one of my numbers "243" was really "1143".) (oh, and one of my 4-digits were transposed)
I've updated the chart and attached.
I'm sorry ,I thought you already know all the Kanji numbers & have the date base for the years...
I would translate for you if I knew it will take you awhile to do it.