Even if it is an old thread from March...In the absense of Hans' volume II here is what I found so far:
The first generation G-45 Hank Williams Jr. models had the more traditional Guild headstock and were made in the 1982-1986 timeframe. Pickguard available with engraved name
or optional simply black pickguard.
Both "DG1000xx" and "GD1000xx" serial numbers.
The reissues had the narrow snakehead headstock and came out around 1993 till 1996. They had the name on the pickguard.
Both "FG0000xx" and "FG4500xx" serial numbers!
Here's the first generation from the 80ies with the traditional headstock:
And the Hank pickguard version:
March 1983 pricelist:
And the second generation from the 90ies with the snakehead and a different pickguard shape.
Actually there was a "final" model with that same DNA, means laminated arched maple back, this time with traditional headstock again, which was the D-60 model that came out 1998, but without any Hank Williams Jr. endorsement anymore:
Ralf