Vintage Satellite Ground Components RF Isolator 60 db SGC Inc 7419 Astrolab

Vintage Satellite Ground Components RF Isolator 60 db SGC Inc 7419 Female end says Astrolab Inc. 16301. The male end says amphenol 49000. . I’ve spent over an hour trying to find information on this or something similar. Heck I can barely find anything on SGC. Seems pretty rare I reckon. Any information on what it’s for or what it’s probable value is would be appreciated.