These 4 watches are part of an assortment I got this past weekend, but I'm having a lot of trouble finding any information about these particular watch brands. Can anyone shed some light on possible age, maker history, and what tool I need to open the two that have screw on covers? The first two watches are automatic, and the Benrus movement comes out with the case back. when I removed the movement I found the rotor and 3 tiny screws sitting on the case back, so of course it doesn't run. The third watch is a French watch that I can't quite make out the name of, but it also has a strange screw on cover that I need to find a tool for. The square Lucurne with blue dial runs, although it loses 1 minute per hour. I just can't find any information on it!