Devrep,
Pictures! now that's the way to respond! It also raises more questions though...like...it looks like your gun has a single selective trigger with O & U stamped on the top tang and the left/right lateral safety...but the low serial number suggests the gun was manufactured well before Val Browning applied for patent protection...I have never owned a double trigger superposed or a twin single trigger, so I don't really know what the top tang is supposed to look like on those models.

Under the supposition that FN produced about 2000 superposed shotguns per year for the first 8 years of production...yours appears to be a first or second year produced gun...so 1931 or 1932 but no record of superposed single triggers until Jun 25, 1936...

I clearly do not understand...perhaps the twin single trigger gun came with the lateral safety?...or maybe Browning produced single triggers well before applying for patent protection?...or maybe 1294 was re-fitted after 1936...

Was there an older thread that covered the pre-war supers?