The reproducer on this portable on eBay was interesting to me (as I had never heard of Caswell before), so I cut it out (and added it to our stock avatar gallery):
According to the The Encyclopedia of Recorded Sound, 2nd Edition, they were a maker of portable phonographs, first advertised in 1926.
I picked one of these up yesterday, (round, wooden horn). The lid supports are missing and the mechanism that keeps the tonearm up during transport needs a little work. The calf skin covering and the handle are in remarkably good condition.
Does anyone else have one? I can’t find any pictures of one that is in good condition.