That is a late 60's-1970's Evette-Schaeffer, made by Santoni, Italy. If it has a lily insignia on the bellbrace.
The person (whether you or someone else) looked at the Santoni/Evette serial number and cross-referenced it to the Buffet (France) serial number lists....thus came up with incorrect fabrication date.
They were ubiquitous band horns/student horns in Europe in their day. Not bad players at all, once worked up into good shape. But even one in good, serviced playing shape has only a market value of maybe $300-350 tops.
In non-playing shape, as a project horn, worth perhaps $125.
If perchance the bellbrace insignia reads "BC"...they you likely have a stenciled Buffet Dynaction or Super Dynaction, which IS a FIND. But I doubt it is one of those.