My goal is a 1941 Long Branch and/or Savage (just gotta love the bolt release catch versus the bolt release slot that is prone to wear and damage). I know that the bolt release slot was introduced in 1942 for Savage and Long Branch No.4 Mk.1*s (and that is why they have the *), but was there a period in 1942 when the bolt release catch was still being installed (ok, the simple version of the question is this - do 1942 No.4 Mk.1s from Savage or Long Branch exist?)