Good luck, there are many around,
Model 64's NY-1 are very good, my favorite

I have a few, some I shoot alot, some just sit in the safe.

Be aware there are fake NY-1 around and trust me I have seen plenty

One clue is the "NY-1" does not line up and the spacing is off as well, it looks like some guy with a punch and hammer was having a bad day.

Also the fitting of the spurless hammer is horrible, the action is binding and stiff. Later in the early 90's they changed to a bean blast non glare stainless look.(frosted) with the serial # above the trigger guard on the left side as you can see in the pics above. (thanks ladder). The early ones in the late 80's did not have the non glare stainless look.

I hope this helps

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sal1911a1