No idea whether the Uhrenfabrik Senden ever sold watches.
But the brand Rensie (simply Eisner spelled backwards) was also the trademark
of Paul V. Eisner & Co., New York, an importer and wholesaler of Swiss watches.
I'M MARK in Houston, I am 59 - my mom was cleaning out some old things she had and my dad was given a watch with his initials on it many many years ago. Mom gave it to me and it runs perfectly. Has a 14 k gold case and is a man's watch. I will have to take a digital picture of it. There is not much I can find, some of these old watches on some auctions sell for thousands of dollars and also hundreds of dollars.
The watch I have might have been a 15 dollar watch. Since back in the 40's and 50's that was a lot of money.