Unknown (to me) mark on #4 stock...

[mhb]

More photos...

Though I don't think they will add anything that might help resolve the issue. And, I have to apologize for the quality of the pics: partly the fault of my camera and skills, and partly due to the condition and/or locations of the markings, themselves.
Still, I don't find anything but the normal British markings:

mhb - MikeDSC00531.jpgDSC00532.jpgDSC00534.jpgDSC00535.jpgDSC00536.jpg

[mhb]

And a few more...

apparently, I couldn't add more than 5 attachments per submission...DSC00539.jpgDSC00541.jpgDSC00545.jpg

mhb - Mike

[Merc]

Mike,

BTW, currently visiting my sister in Cave Creek.

Your No. 4 is in nice shape. It's interesting to see the British made version. JB is probably correct. We may never know its history.

My 1944 Savage-built No. 4 has no comparable marks on the wood except two small letters near the trigger guard which were probably inspector's initials. All other marks are on the metal parts. The black paint on the metal parts was nearly all gone when I bought it.