I've gotten into restoring and repairing 1950s era Bulova (and Gruen and Wittnauers).
One issue that I keep coming across is how to open/close screw on (ring type) case backs.
Did Bulova make a specific tool for this? If not, what generic tool do you use?
I've included two examples of the kind of case back I'm referring to.
Any help is greatly appreciated. Levine98