I think he's right about the date. I looked for info on Vega guitar serial numbers and found there's nothing available. I did find a couple of references on line who suggested that they might have used the same serial number system for their guitars as they used for their banjos, which is what Vega is really more famous for. They made some of the most sought after,high end vintage banjos. I found the banjo serial number info and if this assumption is correct, your serial number does indeed fit somewhere between 1963-1964. Here's what I found:
10300...........................1962
10522...........................1963
12130...........................1964
I checked out the Mermer site. Wow!
The guy builds beautiful instruments!