SAKGuy's image above is the only picture I see of the knife, so I don't see a blank reverse tang stamp. Scissor spring might be black, might be lighting on a late 70s silver spring. From just this picture I'd guess that this was an early 80s model - 80s style scissors with the larger spring, stainless steel inlay, plastic tweezer and Officier Suisse rear tang stamp. Honestly though, without better pictures or the actual knife there's no real way to be sure. It's definitely a pre-85 model.
Are you looking for a specific Champion version, the earliest version with the mag layer, or just trying to collect the different permutations of this model?