Very strange specs. Seat post size suggests entry level, as does the kickstand plate and 3D dropouts. While I haven't seen this particular serial number format before, it is typical of Taiwan or China and should be circa 1989-1990, However, that 35mm, right/right, bottom bracket is really confusing. Wider BBs were often used on ATBs and hybrids, but I though that by that period French standard threading was obsolete, even in France! The JIS headset doesn't necessarily mean Japanese. It was used on a lot of entry level models. What's the rear dropout spacing? Any markings on the fork's steerer tube?

The construction method is really hard to identify from the pics. In some places it looks like there may be scallops indicative of TIG welding but overall it smoother like it's brazed. The external fillets look larger than typical for an internally brazed frame as produced some French companies.

That bottom threading is really perplexing given the apparent era. Pending further evidence, I can't state much more than the fact that it would appear to be an entry level, possibly chain store, city bike/hybrid circa 1989/1990.