Maybe
not so Elgin related, nor changed-out, but perhaps Emblem and Walt Hood Heavy Service.
https://thecabe.com/forum/threads/sprocket-compilation-pic-heavy.41683/page-8#post-913538
Take a good look at the offset of the drive pin, might be about 2" center to center.
Then measure the crank thread diameters,
might also be 1/16" fatter than more common cranks.
There are Emblem (mfgr.) and W&H (retail/wholesale) pictures on this site, (some from a catalog sold by an important member), that show various Emblem chain rings, and the 4-square like yours on various models, at different times; even the motobike frame (114) was sold as a Heavy Service model. Emblem was 1 of few frames with a 3/4" (smaller) truss bar on its curved truss and motobike frames. The kinked truss rods and lower support plate (or offset arms) of the fork assembly are also Emblem features, the rear stays as well.
https://thecabe.com/forum/threads/1930’s-bike-frame-fork-28”.143944/
The different joint details (squared versus rounder) may simply be cost-improved methods.
WRT
Emblem Angola NY bikes, it seems that a Buffalo company that they acquired gets much of the attention for some reason.
A shipyard bike, (unlike a factory bike), never begets a question like, "so, did grampa ride his bike on the ships gramma?" - ya, right kid, sure he did.