Hello -- absolute newbie here...

I have come across a neglected but intact dinghy which appears to be a 5o5 but whose hull registry does not appear to conform to the 4-digit numbering system. It appears to be fibreglass, has a D-type mast. The small aluminum plate on the transom reads as follows:
RXR 51935
151078

Any idea who the builder is? The second number looks like it could be a date, i.e., 15 October 1978.
Wondering whether to make an offer or run away very fast.

I found out I could search Manufacturer's Identification Code (MIC) at the US Coast Guard website.
www.uscgboating.org/recalls/mic1.aspx
Apparently RXR stands for the (now defunct) Lynch Yacht Store, Denver, Colorado, USA.
Seems to have gone under -- two years after this hull was made.
I couldn't find any other examples from this company on the web.
A boat of little significance, seemingly...

Found the hull number - 5849, which makes it a 1976 Rondar. I may investigate further.