Starting with Gold Cups, a 1966 on top, a 79 GCNM MkIV Series 70 in the middle and a 1988 GCNM MkIV Series 80 on the bottom.
Moving to newer Gold Cups a 1996 GCNM MkIV Series 80 on top. This is an enhanced pistol and the last year for the steel trigger. In the middle is a 2010 GCT and on the bottom a 2012 GCNM MkIV Series 80 "round top". These all had rubber wrap around grips which I replaced with wood stocks I ordered off the Colt website back when one could order them there.
From the SS world a 1988 MkIV Series 80 on top and a 1990 Delta Gold Cup on the bottom. Here the rubber wrap around grips were replaced with wood stocks ordered from Altamont.
And newer would be two both made in 2015. A SS GCT and a blue GCNM MkIV Series 70. Again the rubber wrap around grips on the GCT got replaced with wood stocks.