Colt milled vs stamped trigger

[FLATLOCK]

What is the latest serial number observed Colt 1911A1 in original condition with the milled trigger ? Also , what is the earliest serial number observed original Colt 1911A1 with the stamped trigger ? Thanks for your input !

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[Duane Hansen]

Stamped triggers were adopted in August 1942 by Colt and began at approximately serial number 1,200,000. There is always overlap and you will most surely find stamped triggers before this and also find milled triggers after this.