Alfred,
The suffix on your gun is a "n".

Alfred,
The pictures in the book are the suffixes from magazine bottoms. These may differ in appearance from the suffix on the gun in the same year. In 1941, the "n" on the gun frame is a little different than the "n" on the magazines.
Tom

Thank You gentlemen for your feedback , much appreciated.
Alf.

This thread would make a nice forum "stickie"!