I realize this is just a technicality, But, as I recall the 37 does not have a "hammer". I have never owned one of them & has been a while since I have even looked at one. However my recollection is they are Striker fired. The "Hammer is in reality just a cocking piece, it doesn't strike a firing pin.

Personally I always liked the old Iver Johnson Champion or H&R Topper layouts with conventional hammer & firing pins better than the 37, but of course that's just one man's personal opinion. Apparently a lot of folks liked them.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra