The ST-100 was made between 1979 and 1981 primarily for the European market. It was a non-catalogued item not listed by Browning although a very few made it to the USA. I don't remember if it had a dropout trigger and the impact adjustment was totally unlike the Citori Plus. I hope this helps!!
Dan..I just bought one, in fact it will be here Tuesday. The gentleman I bought it from mentioned that he had two of them, and would sell me either one. The one I didn't buy has a Graicoil type recoil device on it, and an adjustable comb. I don't know if he will sell it now that I bought the other one, but it won't hurt to ask. e-mail me and I'll give you his phone number, and let you know what he offered it to me for. Gary L.
I have one unfired ...it is basically a straight stocked trap model Superposed..the trigger is fixed..no drop..not adjustable for LOP..it has what looks like a very wide Broadway style rib but it is raised at the rear about 3/8" high and comes down flat to the front of the barrel..the barrels are open in between ala K80...POI is only adjustable for bottom barrel by way of a sliding bracket exerting pressure on the middle of the top of the barrel basically making the bottom muzzle arch "up" to raise POI..the closer to the muzzle you slid the bracket the higher the poi.
Thanks...I inherited the gun form my dad now deceased..its still at my moms in the gun safe...its mine but you know how it is with a fathers things ...even when they become yours it never feels right to disturb them out of respect..He showed me the gun a few times and explained the POI adjustment...maybe I just remembered a$$ backwards...not a surprise as I'm getting to be an antique myself....I'm really looking forward to that Altzheimers...I'll meet so many new people "every day"
I bought my ST-100 new in 1980 (C$3750). It is a true Superposed built in Belgium. It is 30" choked IM/F with mechanical triggers and has an adjustment wedge that can change POI on both barrels. They came with high grade circassian walnut, fine checkereing and engraving. Browning also made the ST-80 which I know was sold in Europe amd Australia. I wish they had offered 32" bbls. That would have made the gun perfect. Close to a dozen were sold in Alberta, and in fact the gunshop I worked in sold 6. I have put 35,000+ rounds through mine. It will be my doubles gun 'till I cash in my chips. If anyone wants to know what they look like, post your email address and I'll send pics.