Just purchased this one as part of a lot of 2 with a one sentence description and one far away photo. Much to my delight, once in hand it appears to have seen very little wrist time and the other (40's mens Wittnauer) looks NOS. Have yet to clean it up, it's shown as received. I wound it and put it on. It's been running now for 26 hrs and keeping remarkably perfect time.
Crystal appears to be a replacement? One other Senator in the database sports the same. I haven't disassembled it yet, the movement is such a tight fit in the case back that I assume it has never been apart.
It took a while to find this one. but I found it in 1964Linebook156.
1962 Senator " I " on the original Kreisler band in the original clam shell. Band links are 1/2 polished and 1/2 matte finish. I think this one might be a first for the database.