Congrats on you're new acquisition! Considering the recent vintage of your SBT, smart money says that there is decent historical data on her. A research letter would likely shed more light if it were the last recorded example. I shot my SBT, first year example, just last week at the Fall American Challenge event in Georgetown, SC, and I can tell ya it was a real hoot! We had an entire squad of Elsie SBT shooters on the line, and we came within one bird of beating all comers. (Darn It!) Team Winchester sent In a hit squad...but we'll be waiting for them next year!
If your gun turns out to be the last, then make sure to enter it on the chronology page, Lots of interesting examples there!
Welcome to the Elsie Addiction!