Low prices are tempting, but the cost of service and repair can exceed that of the acquisition.

Several years ago I bought the watch that would kickstart an obsession with old timepieces: a 1970s Seiko 6139 chronograph, acquired on eBay for a cool $130. Was it rough around the edges? Sure, but for the money, it felt like a hell of a deal. 
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https://www.gearpatrol.com/watches/a494228/the-downside-of-cheap-vintage-watches/