Just purchased a beautiful model 67 someone put it away and saved it just for me. I would like to know if I can use +P 38 ammo in it as it is not marked. Newer models are stamped, this one was manufactured in 74

yes you can, i have done it for many years with guns a lot older than yours.

What Ronnie Gore said! It's a K Frame and will shoot +P's all day long, every day.......

Yep. And it will shoot them well. One of Smith and Wesson's best K frames ever built. I am envious. Been wanting to get one but haven't found any in my area and hesitant to pay what folks are asking for them.