Thanks for that informative post. So is there any way of distinguishing markings that will signify when it was made? I also found a couple more things on it, upon closer inspection. One is R7 and the other says SURREY
If the receiver is marked "Long Branch", it is made in Canada likely during WW2.
I think the (F) engraved on the left side of the receiver means it was inspected and maybe repaired by Fazakerley Royal Arsenal before being stored postwar. A lot of those were sold back this way through Interarms and other importers.