1969 GM 4:56 Ring and Pinion

[ricklsandy]

Hi all, I've had these since the late 70's. I pulled them out of a 1967 Chevelle in 1978 and just held on to them. The pinion is stamped GM 2 69 3916231 9:41
The Ring gear is stamped 2 GM 3916230 9 41 8 70

Do I have something special here or is it run of the mill?

I'm intending to list these on eBay but wanted to pass it by you COPO experts before I do.

Thanks,
Rick