There are no markings but this customer's instrument is a Harmony (Chicago) build for sure. It's an interesting one, however, because it's quite deluxe and then also at the same time closer in style in some ways to the relatively plain "California style" banjo ukes that, as far as I can tell, dominated their banjo uke output.
It's got a regular 13" soprano scale and the neck has a thin (front to back) but wide (side to side) profile which is common on their "California style" banjo ukes but not something I'm used to seeing from their more upscale, heavier-duty banjo ukes like this one which have a full hook/shoe style rim and, in this case, a resonator. These usually have a thicker neck with a thinner nut width which means they can take steel strings, too, if desired. With something like this one's neck (which is more comfortable in many ways) you can only string it with synthetics like nylon or fluorocarbon as the tension is less.