Arched-back D-25s appeared in 1973. During the early transition period, there were some all-mahogany (incl top) arched back models made. By '74, most arched back D-25s have spruce tops (usually stained). The SN lists take the model as far as 1997... but I think it may have been discontinued before closing of the Westerly plant (but I could be wrong). When production moved to Corona, the all-mahogany D-25 was re-introduced with a flat back.
Although it isn't uncommon for labels to come loose and get lost, it is much less common to not have the SN imprinted on the back of the headstock. It's absence often indicates refinishing of the headstock and/or neck.
In the early to mid-70s, Guild often stamped dates on some of the subassemblies during construction. One common date stamp can often be found on one of the thin braces flanking the soundhole... which can be seen with an inspection mirror and flashlight. When present, this date marks completion of the top assembly, before the body is glued up. Final completion can be months later... but at least this will get you in the ballpark.
Good luck...
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