Toward the end of Elgin's existence they sold many imported movements made by other companies. These are mostly Swiss, and mostly wristwatches. This one however is a French-made 16 size pocketwatch, Elgin grade 755. Not a lot is known about these, including what company actually made them.
The finish work is simple and relatively crude. And it has a number of characteristics typical of European watches, the style of the dial screws for example. There's also simple shock resistance balance jewels.
I find it odd that there is a cap on the lower escape jewel, but only the lower. Also, nearly all the screws in this watch are identical, including the case screws.