I have reason to hope about the Benrus. There are few active watchmakers in my area who have the skills and desire to work on older non premium watches. But today I visited a semi retired gentleman to pick up my Bulova alarm - the earlier Junghans movement - and not only did he do a good job at a good price but he has a supplier of old parts. He seems to find it amusing to work on these and to chat with me, so I will see how long his patience and eyesight last!
Ginger