I think they're the same. In 1950 the target version was introduced, which had the adjustable sights. The other version(s) still had fixed sights.
I don't think there was really a MK I until there was a "MK II". At least it wasn't stamped on the pistol after it came out, but not on the MK I.
I don't think there was really a MK I until there was a "MK II". At least it wasn't stamped on the pistol after it came out, but not on the MK I.


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