The 92SB was the second upgrade following the 92 and 92S model during the early '80's. The 92SB version had a firing pin block added and the magazine release relocated to behind the trigger guard from the base of the grip. There's a compact version of the SB as well with a 13 round capacity, the 92SB-C and a type "M" with a single stack mag capacity of 8 rounds.
I don't think your 92SB is worth any more than a modern 92FS. I think it's less desirable as it preceded the F modification with an enlarged hammer pin head to prevent the slide from flying back in case of breakage.
The 92F had the grip and trigger-guard reshaped, followed by the 92G (Gendarmerie) where the safety lever is used only to decock the hammer. No safety capability.
Then came the 92FS version with the enlarged hammer pin head to stop the slide from flying off the back, then the 92D double action only version, the Brigadier with the beefed up slide and dovetail cut into the slide for the front sight and finally the Centurion, the Vertec and the Beretta 90two.
In short you have an old gun that may or may not be safe to shoot for fear of the slide flying off the back. It also requires the appropriate magazines with the notch cut on the bottom to function with the annoying catch near the base of the grip.