But that just makes me wonder why my D-4 and D-25 didn’t have them. I’m not sure about my D-4 but my D-25 has solid mahogany sides from what I could see pulling the end pin out.
Yeah both solid sides, I assume your D25's also an archback, and what year? (apologies for not remembering). If also say a '73-75 then yeah I'd "expect" the fabric "braces", but I don't know.
Anyway, the D4 at least just shows how build styles evolved over 20 years at Westerly.
From member reports I recall, in early Westerly ca '67-'72 the builds still closely resembled the "light" Hoboken style. By '72 they were already starting to show signs of a gradual "beefing up" which evolved 'til early '80's when Gruhn designed a couple of new flattops and F40 variants, and builds started lightening up again from there.
So, '73, sellin' a lotta guitars (singer songwriter boom), maybe startin' to see some warranty pain even if due to owner neglect like stringing 'em up too heavy? Solution: start beefing up the builds, and Guild's "built like a tank" rep was born. Even started shipping at least some dreadnoughts with mediums, up from lights.
But by early '90's starting to lighten up again, and build for lights. And techniques have advanced, too. By D4 time ca '92, probably just deemed the fabric unnecessary anymore?
I always considered my '96 D25 a real featherweight, and in fact it's taken a couple of "moderate" knocks and is still in good geometry at...at... oh good lord she's gonna be 25 in October!
Go forth and bond with thy guitars.