I saw a Roy's original pancake holster on ebay with 29 and TH on the back of the holster . They say it is for an N-frame . Does anyone have one and know if that is the model number for an n-frame?

All N-frames are pretty much the same size - frame and cylinder at least. Some have short lugs, others full length barrel lugs. I have several N-frame revolvers with short lugs, and they seem to fit the same holsters equally well. One pancake holster (Alessi CQC) is for a 4" barrel, but a 3" 629 rides in it just fine, including the amount of retention. I suspect an holster made for a full lug barrel would work okay with a short lug too. That's true for a couple of L-frame revolvers in my stable. Most of the retention is around the cylinder and a dimple that fits just inside the trigger guard.

Yes, that is the model number for an "N" frame. The "TH" denotes that the retention strap (thumb break) is cut for a target hammer. I have several of them (for N, K and J frames) and they are some of the best carrying/wearing holsters I have ever owned.

Thank's , I tried the various search engines with no luck , should have gone to the experts first .