That the bridges on your guitars are tight to the top is good; that's exactly the way they were when they left the factory.
That doesn't mean the bridges are glued down to their very edges. Unless someone reglued them so that they are glued to the edges, they probably aren't.
There is about a 1/16" area around the perimeter of the bridge that is not glued down. Likewise, the top lacquer extends a corresponding 1/16" under the edge of the bridge. That tiny area around the perimeter of the bridge is not glued to the lacquer.
I'm not sure when Guild started building guitars this way, but sometime during the Westerly era. So far as I know, that build design continued at every factory thereafter, at least to New Hartford. They may stll be building them this way at Oxnard, I don't know.
You may be having trouble with the word "gap" -- the bridge should be tight to the top; you shouldn't be able to slide anything under the bridge; there shouldn't be a gap. A intentional gap between the bridge and top was not built into the design.
The fact that you can't find one on either of your guitars, after however many years now, is good -- you may never encounter this problem. Be thankful!
When you (not just you, but anyone) can slide something under the edge of the bridge -- and it will invariably be under the back edge behind the bridge pins -- it will likley be because the top has begun to belly behind the bridge, a somewhat common occurence.
That's when this gap that has been mentioned will appear. You may not be able slip anything under the bridge with the strings off, but when tuned up, you may.
How big or small a gap will depend on how much bridge lift there is, and that will depend on how much the top has bellyed over the years.
I don't know how many Guilds I've owned over the years, but lots. I'd say about a quarter of them had some bridge lift issues when I got them. So I'm speaking from some expereince.
You could argue that not gluing the bridge fully to the top, all for appearance sake, is a weakness in the design as it may more readily allow the bridge to eventually lift where it's not glued down.
But however you feel about it, it has been, for a long time now, "The Guild Way."
Hope this helps?