The BSF model 55 rifle is probably what you're thinking of - they were very popular in the US, imported by Air Rifle Headquarters and then Beeman. Same barrel-cocking gun with a longer barrel was the model 60; BSF also made a good selection of smaller junior rifles, the rather unusual S54 underlever, and the S20 pistol. The rifles were available with basic beech and upgrade walnut stocks. The "BSF" logo is most common, but guns were also sold under the"Wischo" and "Bavaria" trademarks.
Here's a BSF 55:
View attachment 371439 BSF was sold in the early 80's, and the new owner re-issued the guns with revised stocks and other details. But this failed; they went out of business in the late 1980's and Weihrauch bought them. For several years after that, some interesting "hybrid" rifles were made as HW used up BSF parts, many being sold here under the "Marksman" name.
Danny Garvin's "Vintage Airguns Gallery" site is always a great place to look when researching older airguns. Here's the BSF section:
Images, manuals, catalogues and other ephemera of vintage - BSF - airguns and ancillary products.
forum.vintageairgunsgallery.com
There is also a nice BSF collector's group on Facebook.