Franz Jaeger moved his family to New York with the idea of starting a gunmaking company here in the USA. He could not find enough skilled workmen so he returned to Suhl. When he was in NY they had a son, Paul. Because Paul was born in the USA he was a citizen and returned later in life. (I'm working on a Jaeger article so that's it for now on the history.)
The early mounts sold by Stoeger and sold by Paul Jaeger I believe were all made in Suhl at Jaegers.
There are many of these mounts around, the very first, like on Terry's rifle have a hook at both ends, I'll try to find a good picture.
Then came the mounts with teeth, these were used on the early Philadelphia Paul Jaeger rifles.