I assume you are still collecting data on SBTs. I just acquired the following:
Serial number: 190224
Barrel length: 32
Type of rib: solid rib with rectangular rib posts
Rib inlays: silver
Type of stock: pistol with cheek piece(never seen one but heard they were out there)
Shape of forend escutheon: Banjo
2-56 Screw: present
There is an interesting story about this gun. I have been looking for a Specialty SBT for several years. I have been searching all the typical auction sites and use the standard gun search engines. When watching a boring Monday Night football game, I decided to search deep into Google search. Usually Google returns the "typical" sites on the first page or two. Most people don't go much much deeper than two pages. I don't. normally. This time I kept digging, mostly expired old sales. I kept going to page five! and there it was. I called immediately. I asked the seller how long it had been listed and was there any interest. " Been up for six weeks and you are the only caller." I bought it. I suspect that had this been on one of the typical sites that show in the first page or two it would have sold in a heart beat, and at a price a lot higher than what I paid.
I won't say I stole it but I feel that way. The moral to the story is that if the game is boring on Monday Night Football, dig deep in Google search. Amazing things can happen!
I am curious now how many SBTs were made with check pieces. All numbers on wood and metal match...it is original.