Originally Posted by
VintageSteelEU
Well, got some more numbers to add. I'm working on 1980 Motobecane C5 right now.
[snip]
I could uncover some numbers and see them clearly.
The main number on the BB shell is 05315492 and further towards the rear end of the bicycle there is 3109. On the front side it's stamped with "P" whatever that might mean. On the down tube there is 579 stamped near the BB shell. Barely visible in the photo, but clear enough when looking at the frame in person. Manufacturing date of the tube, perhaps? Head tube lugs have both BCM (Bocama?) stamped on them. Fork dropouts are marked "Huret", there's nothing I can see so far on the rear dropouts. The seatpost binder lug has 72 stamped on it. I'm assuming it's the seat tube angle.
[snip]
Well, found 1750 on the drive side dropout after all.
This caught my eye as I was about to post.
An almost un-ridden Jubilee Sport has arrived, and it has "3109" on the BB shell in the same place; pics below.
I think it is all original, except for the tyres and tubes (missing).
It does not appear to match any of the Jubilee Sport models in the catalogs at bulgier.net, it's much more french.
Wheels are Rigida narrow rims with Maillard low-flange dates-codes 05/82 and 45/81.
Mechs are Huret Rival date-code 03/82, front is a Challenger or similar.
Crank is SR Custom, pedals SP-150.
Brakes Weinmann AG500.
Seatpost SR laprade, seat Selle Italia.
Stem SR, bars have the Motobecane M engraved on each side.
The forks have a Vitus 888 sticker, there is no tubing decal on the frame.
I think there never was one, everything else is nearly intact.
The frame weights 2305gm with the headset cups in, it's 57cm c-c.
The fork weighs 760 with the crown race on.
Seatpost is 26.2, seatube is 28.8 (plus paint), and the post IS the correct size.
Chainstays have no seams, but the headtube and steerer do.
The fork has a nasty looking bit of internal reinforcement.
So the gears and the wheels don't match, the tubing is missing a sticker and the seatube must be 1.2mm wall, which doesn't seem to match any of the catalog specs.
Here are the bb numbers - the 224900 is also on the driveside inner rear dropout face.
