I've got C004779. As you'll learn from the musicmanbass.org site, serial numbers and dates are hard to correlate for the pre-EB MM basses, as the serial numbers were stamped on components that were stocked in huge bins and consumed in a random order over a number of years. Yours is a pretty low number that was *probably* 1979, but you'd need to look for other date stamps inside the bass. The Sabres were very nice basses, but never sold as well as the Stingrays for some reason. Ironically, it's the Sabre-like dual pickup L2000/L2500 models from G&L that caught on best when Leo started over again (again).
'berger XL-2 => EBS HD350 => EBS Neo212
Steinberger Club #0013, Pedulla Club #147, Pre-EB MM Club #44 , Epiphone #90, EBS #34