Nice looking gun, from what I see, in wont of a barrel. Poor thing. Someone wanted to make themselves a 1955 before the 1955 came along.

I have a 1955 with the W mainspring. It works fine, but if I were having trouble with it I would replace it with a standard spring, as was suggested. I could never see that the W mainspring improved things much but it does make some people scratch their heads when they see it.