OK.
Here is a shot of the DeArmond SF "barrel" bridge next to my spare, NS, "wood saddle" bridge. As you can see, not only is the spacing of the mounting holes different (as noted in my previous post), the bassplate itself is also slightly, though not dramatically, different in shape. Note especially that the "ball-end" end of the DeArmond bridge is wider and the overall width of the bridge is also slightly wider.
Other random observations:
•Guild NS-SF nut is 1-1/2" wide, while that of the DeArmond is closer to 1-9/16" wide.
• Guild NS-SF string spacing at the bridge saddles is, maybe, 1.5mm narrower than that of the DeArmond.
•The entire bassplate of the Guild can be raised or lowered with two Allen screws to affect string height, while the DeArmond lacks those two screws (and the holes into which the thread). The DeArmond bassplate always lies flush on the top of the bass and string height is affected with adjusting screws on each, individual bridge barrel.
Westerly comparison:
•Westerly barrel bridge seems to be pretty much the same design as the DeArmond, with these possible differences:
-Westerly appears to have been stamped from slightly heavier-gauge steel
-quality of plating on Westerly looks superior
•Westerly nut is 1-1/2" wide, which minimizes any playability "feel" differences due to the minimally wider string spacing at the bridge saddles.
Please note: any other, perceived, visual differences you may detect between the bridges based on the above PICs may be due to phone camera lens distortion. That issue has cropped up before in other PICs I've taken with this particular camera.
Also note (if your fastidious like myself): No beautiful flame maple tops were damaged while shooting these PICs: a folded paper towel was placed between the bottom of spare NS bridge and the top of the Westerly to provide cushioning and avoid marring the finish.