OP, welcome to the forums.
My 38's shoot similar to Loonwulf's 99's - high at hunting distances (for me).
Never bothered to measure, but never had to hold over a target or raise the sight!
Curious as to your method of dating on the 38.
I have not seen yearly production figures out of the Royal Arsenal.
A Type 38 from that era would have some collector potential, especially if it was all there and was straight.
Most got used up in the Asian campaigns long before the U.S. got directly involved,
and many of those that still had a spark of life were pulled from service for training purposes.
Sounds interesting.
JT