Don E.,
On the left side of the grip frame is a group of proof marks. One of them, two digits in a little shield, is the year of manufacture.

What's the cut-off, 50 years? Then no, the KGP pistols would be modern. And if so, 1966 or before would be C&R.
Unfortunately, unless one can wrangle a discount at some supplier or other, a C&R is absolutely worthless in NY State due to State Police regulations.

No SBRs or suppressors permitted, federally allowable notwithstanding.

We have to have ammo sent to a dealer and p/u there.

Still no background check for ammo yet, such as the latest law "requires."