I'm afraid that's just not enough information to help. Can you see what the model number of this RCA VCR is, and not simply a serial number? That's really the number that matters the most, for something like this.
I will say, however, the I'm not aware of any high quality RCA VCRs. If you're using one of these VCRs to transfer tapes to DVD or another digital format, you'd do much better use one of the suggested VCRs that give you high quality video optimized for digital conversion.
You'll find that list here: http://www.digitalfaq.com/forum/vide...ing-guide.html