Thank you all for your input.
Without the FL and peculiar serial no, the lens looks a perfectly normal 19mm LTM lens.
Unlike the Nikon inventory, we do not have a clear serial tracking system for Canon.
Post repair hybrid is always a possibility as we see a lot of hybrid on nowaday Canon Rangefinder due to sharing of parts from dead cameras.
Co-production of the FL and Screw lines was also possible as the two are optically identical.
BTW, Raid you did share pictures form your 19mm. Did you sell yours ?
Optically and sizewise the 19mm cannot compare with my ZM 21mm 4.5. However the joy of using a Canon vintage 19 on a L1 to take pictures is not measurable.
I bought a A7 to utilize my range of old manual lenses, however, I still like the old Canon Rangefinder and film pictures better