Originally Posted by
verktyg
Looks low mid range priced Asian to me - the tell: stamped steel fork crown, swagged seat stay tops and inch sized main tubes.
What's the diameter of the seatpost? That's somewhat of an indicator of the seat tube wall thickness and the quality of the tubing.
Here's a suggestion of the areas of a bike to photograph to get more than guess responses.
Chas.
In the first post he says it's a 28.5mm seat tube with a 25.4mm post, indicating imperial tubing and hi-tensile steel. It also had an English threaded BB shell. However, the serial number format is consistent with later Motobecane/MBK. Do you know what year they switched to imperial tubing and English threading?