I don't know , this has a mag lock , and the base was soldered on after it was chromed as it is still brass ,it's a real quality item all the rivets are also still brass as is the badge
I also have a fully chromed Protector type 1A which looks like it was assembled prior to dipping and I have an old W E TEALE also fully chromed but alas not in the best of health
and a CEAG B3 fully chromed Lol
I have the protector catalogue from the 70's / 80's of all their presentation pieces , and it's not in there