Can't be answered without knowing who made it.
Age of smith Wesson serial no 5K4166
ethiopians first had the gun in their secret camp on mount gonder.
a lot
If barrel is round, it is a post-WWII Model 29. If the barrel is octagonal, and the grip is checkered, it is probably a pre-WWII Model 29. If the barrel is octagonal and the stock is plain, it is likely a Model 25. That's as close as I can get sight unseen.
I believe 'pt' stands for patent, as in Colt patent firearms
Requires professional appraisal
You need to identify the make and model of the shotgun. Dozens of different makes of guns show a browning patent on the barrel. Recheck and re-ask the question - Thank you
Yes Einstein was working as a patent clerk when he formulated the Special Theory of Relativity.
Albert Einstein was working as a patent clerk at the Swiss Patent Office in Bern when he published the theory of special relativity in 1905.
The Standard Catalog of Smith and Wesson, 3rd edition, by Supica and Nahas.
$500
You'll want to file a design patent application. This basically is a special type of patent for people who have a design for a new product.