They were common around the middle of the 20th century, from what I understand. Merkur makes a modern version, and I've seen "DRGM" stated as maker in several auctions of vintage ones.
A picture google on "vintage travel razor" gives a lot of results.
Gilette made a version with a tiny one piece handle, while most other handles separate into two threaded parts, that slide into eachother after dismantling.
I got most of mine fairly cheap on ebay som years back.