Thanks, Bill. Somewhere on the web I saw a 1972 version of my GC-10D with the very same crazing, possibly even more extensive. The guitar was being offered for sale in that condition, and I believe the price was close to $1,000!
I learned later on that lacquer finishes are psrticularly susceptible to crazing, and lacquer was what was used on my instrument. You might want to see this article on FRETS.com:
