1924 Ish BSA Commercial, South African Property Mark

[CoatiMundi]

Thanks for the information, this one is well traveled .
The mark on top of the receiver looks very much to me like a badly struck “U” with a broad arrow. Possibly one of the No1’s the South African Government “borrowed” from private persons at the beginning of WWII?
jc5, since you mentioned it, I think there is a second crossed swords with a letter mark on the bottom of the barrel. I will see if I can figure out the letter.