ID request

[US-Subs]

Looking for a quick ID and document if possible on the following cartridge:
D - 36.8mm
OAL - 371mm
Headstamp - P9 MB 1944
Projectile stamped markings - m34N43H4 followed by what may be a 3 pronged crown, followed by a fancy scripted JB
Primer - M43 42
Fuze - 5 over K.43

Thanks in advance -

 

[Hoeksel]

The case is the 37x257R56 for the 37 mm Bofors M34 AT gun.

I believe MB is Finland (Kellokoski).

 

[US-Subs]

Thanks, is a yellow band HE in the Finnish color code?