Serial number help
 

Still digging into the history of my Concorde Prelude (and hoping to get some better insight into who built it on behalf of Concorde).
There are 2 markings under the BB shell, one being the size (58cm) and the other being the SN.
Would I be correct in thinking that the 7 is the year of manufacture (87)?
Also does this Serial Number jump out at anyone as being from a particular factory?https://cimg6.ibsrv.net/gimg/bikefor...5b85417950.jpg

https://cimg5.ibsrv.net/gimg/bikefor...8268310866.jpg

https://cimg2.ibsrv.net/gimg/bikefor...d1aa2b41ed.jpg