Originally Posted by Hondo44

They are not original, only the checkered Magnas would be original or the J frame target grips. That's what your letter refers to.

The Model 35 and 35-1 all had sq butt grip frames. The early I frame rebated extended grips have occasionally been fitted to later model guns, especially rd butt grip frames w/o the rebate.

I believe there's enough wood to cover the sq butt grip frame as well.

Does your 35-1 grips have 1 screw or two? The 2 screw are extended target grips from the pre war period.