sp 218748
With a serial number preceded with an "S" , I'm betting it was SKB of Japan
around 450.00
They were made in Japan by a firm called SKB.
You can find these numbers in the manual that come with your gun. They are also present on the handle of the gun.
Manuals for SKB shotguns are available online at the SKB site under Parts. See the related link below.
I just want my qustion answered
how do i find the value of my skb 785 sporting with 28 inch ported barrels
The SKB M-7900 is a pump shotgun not a semi-auto.
shotgun
50-600
Not familar with the 5100, but SKB makes a decent shotgun. Company has been around since the 1800s. Their guns are midrange priced, have a decent reputation.