[Deke]

Here's a picture of a 1911 of the kind PvtColt referred to with the thumb safety you've described. I have one and the thumb pad is checkered. It's from a Remington Arms-UMC manufactured in 1919.

 

[Deke]

Okay, trying one more time to attach a file with the 1911 picture.

 

[Deke]

Ooooops, nice Alumagrips for us jar heads, but the wrong file. Try this.