Hi guys. I bought this cheap not-sought-after vintage Orvin manual winder. Several questions:
1. Is the glass/crystal considered a "domed" crystal? (See pic1).
2. Assuming that it's from the 1960's, would it be an acrylic crystal?
3. In pic1 again, you can see that the case back is not flush with the case all around; one side is more flush than the other. (I'm certain of it because I was able to insert a thin piece of paper on one side but not on the other side) Is this normal or acceptable in vintage watches? And can anything be done about this flaw? (to make it flush...)
4. In connection to number 3, is it possible to replace the stainless steel case back with a display case back? I assume it's not possible.
5. In pic2, is that an intentional dent made by the manufacturer to enable a person to pry open the case back with a case opener? Is that where I should push the case back away from the watch?
6. In vintage watches, due to it's old age, is it common that after hand winding it a little, it won't move unless you shake the watch?
7. On Day 1 seller shipped the watch. The watch was running when I received it in Day 2. (we live in the same location). Very early morning on Day 3, I guess the watch was fully unwound. When I tried to wind it, it took only a few turns until I felt the crown starting to bounce back (move in the direction opposite to the winding direction). (I was expecting I could turn it at least 30 times before I start feeling resistance) So I stopped. But then the power lasted only for about an hour or so. So regarding this issue, I have the following questions:
7.1 Approximately after how many turns should I expect resistance in the crown? Or does the crown turn back on the first turn/wind?
7.2 Should I stop immediately after feeling/seeing the resistance or should I continue until it's REALLY hard to wind? How do I know if it's fully wound? How strong should the tension
be before I stop?
7.3 Seller's pic showed the movement with "UTC" and "17 jewels" written on it. The watch has no date or day. Just hours, minute, and second. How do I wind this type of movement?
Clockwise only? Clockwise then counter-clockwise then clockwise and on and on..?
Apologies for the many questions, I just don't want to break my first vintage manual winder, even if it's a cheap one.
Thank you all for your time!