I will give mine after a few posts reply to this.
my opinion would be any pistol that looks like the above with the same features, doesnt matter what caliber, so long as it looks like the gun above, has a grip safety and thumb safety, single action single stack.
A 1911 is a weapon built to the plans and specks of Mr Browning. Where the parts will change out on the guns made to milspeck from 1 company to another.
Altho it was chambered in 38spl I consider 45 the real 1911
No gun feels as good as a 1911, period, hands down, end of story.
That statement is a tad subjective...