I did some research when I got my drilling about 20 years ago, from what I found T&S was a very good maker and their Nimrod was considered very good.
I emailed some pics to Dietrich Apel, he was quite interested so one year I brought it to the Vintagers and showed it to him. He said he hadn't seen that type safety on a drilling and took some pics for his records.
I also purchased Norbert Klups two fine books, one on drillings and the other on double rifles. T&S are mentioned several times, they are highly thought of box actions, he mentions they are still being produced as mentioned by xausa.