As a hobby, go cheap. But there is a difference between cheapie and a good lens. I've made my own straps out of misc springs
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.......I replicate what I see in pics of real watchmakers
You can buy just about every power out there. All have different focal lengths. A lot of it depends on your age (strength of your eye's ability to focus)
I have a friend who used to work at the Rolex facility in Dallas. He lets me sit in his shop from time to time. I watch in awe and make a million mental notes on his moves.
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