First 4 digits are 71-36, Ruger website shows a 1975 build date. I apologize for the above misinformation. This is my late uncles hunting rifle and going off when my aunt said he bought it. She thought is was late 60's, I guess she was a just little off, and she IS a little off! but remembering what was bought 40+ years ago and being nearly 75, I guess I'll cut her some slack. I should have looked it up, so really it's my bad. Still a very nice rifle, steel is great and sharp, wood has typical handling and hunting marks. Let me know if you need any other info.