The pictures including bell and barrel should help, the design of the metal tenon bands and protection ring around the bell can give additional clues. So far, seems your tech is probably closer to its origin. All the ones I looked at, LeBlanc, Selmer, Buffet, Noblet, etc. could not find a serial number match.
It could be possible that when first purchased, the graphic trade markings were not pressed into the wood but were applied over top, like "painted" in or transferred like wet slide decals on old model airplanes. Use of wipe downs, cleaners and bore oil helped soften and remove these would be my guess. The older clarinets, these were pressed into the wood then filled with glitter paint. Methods I mentioned would eventually remove the paint but the embossing would still be there to help identify.
There are others more knowledgeable, hopefully they will chime in.