1978 Grand Jubilé purchased new spring 1978 from Cyclocentre Sportif on Notre Dame in Winnipeg. Bike shop changed SR stem to shorter 3TTT at my request as part of sale. Price was $378. Crankset, RD, freewheel & saddle not original. Serial No. is 4304087. That is from my records, as the bike is not accessible to me. I believe it came from the bottom bracket, and if there were other numbers I likely would have included them in my records, so probably that's the only number on the bike.
May I suggest that you get your serial # database threads added to the sticky threads index or put the links in a stand-alone sticky? I have several other bikes that I could probably add to your databases.
Thanks for all your diligent efforts!