Pic assist:




The YF007 is just a product number for that cable guide. The serial number is the one actually stricken into the BB shell itself, going around the circumference of it. It appears to end in 10545, but there are probably more digits at the beginning. Will require cleaning up the crud down there.

Also, get a photo of the bike overall from the other side. Seeing the drive components, and how they're fitted to the bike, will provide more info. Is there a head-badge?