The top of the barrel has the name Smith & Wesson Springfield Mass USA
followed by a list of patents beginning with a date that has been worn down but looks like April ** 88 (hard to read year)
March 27 94
May 21 95
July 15 95
Aug 4 98
2 more dates that are hard to read
Oct 8 01
Dec 17 01
On the underside of the barrel is 29446 followed by a circled P.
Inside the gun is a number that looks like 1094.
Thanks for your help.