Perhaps 12 years ago, I bought a like-new 2-1/2" Model 66-4 that came with Pachmayr rubber grips. I thought they were changed out by the former owner but I've since read that Model 66-4s with that barrel came with them. The SCoSW, 4th Edition, does not clarify that, however.
By the way, I'd agree that you made a very good buy. When I bought that Model 66, snubbies were a very hot commodity but I was able to buy it on GunBroker for $416, the opening bid because, I think, the seller listed it as being in "average" condition. Ever after downloading and enlargening his photos, I saw nothing but a possibly never-fired revolver so I made the opening bid, fully expecting to be outbid overnight. The gun that arrived at my FFL holder was even better than I was expecting.
I've purchased numerous Combat stocks for it, all from Taiwan. I have never done as much as clean it.
Ed