[CR]custom-built masi serial number question

i just got a masi frame, and i can't find anything about it on the web, so i thought i'd ask you folks for help.

here's what i was told about it; it's a custom-built track frame from sometime on the 80's (it looks more modern that that to me)

here's what i know about the frame; the name 'johnnie abreu' painted on the top tube lugged it's got track ends, not dropouts, it's drilled for brakes (drilling happened before it was painted), the decals say 'masi gran corsa', the bb shell is stamped as follows -- 52ML25 on one side, and 15T4 94506 R on the other the bb shell is solid, no cut-outs

pic are here http://pg.photos.yahoo.com/ph/dolface_2/album?.dir=/12c1&.src=ph&.tok=phA5AcCBYxzLZImJ

anyone got any ideas? i've looked on google, google-groups, the bates-lee site and come up with nothing so far, so any information, but especially construction details, would be most welcome

thanks,

-galen pewtherer