Record has no cat# on the labels, 500 CG11 / 500 CG12 are matrix numbers. Anyway record was unofficially listed as Gilt-Edge #503 in later distributor ads.
Record labels uploaded, plus distributor ads confirming the later use of unofficial cat# 503 for this record. I haven't seen record labels with that cat# though. Same for Gilt-Edge 500 CG1 / 500 CG2 ("501"), 500 CG3 / 500 CG10 ("502"), and 500 CG-23 / 500 C-8 ("504").