yes
500$
I would start my search at Smith and Wesson first.
You should call S&W to get the correct answer from them.
The original Model 21 (1950-1966) can bring $3000 or more. The current reissue is $800-$1200.
The markings.
Yes, you can shoot steel shot with a Smith & Wesson Model 3000 shotgun, provided that the shotgun has a suitable choke and is in good condition. However, it's important to check the manufacturer's recommendations and ensure that the barrel is compatible with steel shot to avoid any potential damage. Always use appropriate ammunition designed for your specific shotgun model.
Looks like any other pump shotgun. Usually one or two on the auction sites with pictures.
50-350 usd
Best left to a trained gunsmith
100-300 usd
50- 325 USD or so
The Mossberg 3000 was manufactured in Japan, and licensed from Smith & Wesson, who in turn licensed it from Howa of Japan. After 1995, it was no longer imported into the US, although it still remains in production.