[tahunua001]

I do not believe so,
on the last ditch rifles the checkering on the safety knob were the first things to go, yours has beautifully checkered safety knob.

I can't tell from your picture which series it is. the symbol to the left of what kindof looks like the rebel insignia from star wars is the series number, getting a good view of that would help narrow down production year but for now, which what I can tell it's a regular wartime production t99 that's been converted to 3006.

FWIW: the AA sights were often removed by both Japanese and US soldiers that captured them as they felt that they were worthless gadgets that just added weight, same thing with the dust covers and monopods, that's why there are so few with those still intact and that's why the absence of those features are not a clear way of identifying last ditch rifles.