Hello
Excellent find and the price you paid is about Half of the going rate for one of that vintage in today's market in my area. I would suggest you do not educate the people of that gun shop that you bought that from. I would shop there often and see what else they come up with that they have no clue about. I came across the set of grips shown below at a local gun show in my area. They were on a Model 27-2 Blued revolver with an 8-3/8" Barrel. The seller had no Earthly clue of what he had when I asked him if I could see the gun. He asked if I needed the gun, and I said back to him, No, But I sure could use those grips on it. As he was handing it to me he said
"he did not Like Them Fancy Herritt's it was wearing, and felt they Hindered the sale of it". I Ignored what he had said and while looking at the grips asked him what he felt would look better on this gun ? He said if it had a set of Original period correct, factory Target grips on it, he felt it would sell faster. I asked him if I was able to provide a set of period correct grips for that gun, would be inclined to swap with me ? He said he sure would, so I went out to my Truck outside of the show and returned with a nice set of factory Target grips for his Gun. He lit up, when I showed them to him and said
"Now, That's what I am Talking about" I asked if he would like me to place them so he could see what it looked like, and he liked that idea, so I placed mine and sat his on the table. He asked if I wanted to swap and I said Sure.. he then asked if I wanted any Boot with this swap, and I did not have the Heart to take any more advantage of his Ignorance, so I said
"If your Happy with the swap of just the grips, Then I am happy as well" He shook my hand and I dropped the grips shown below in my Pocket and walked away Very happy..

They now reside on my Regsitered Magnum shown below as they are from that time frame. I have found sometimes less is better and if a Person does not know what they have, it is better in most cases to leave it that way...