I have a Omega Seamaster from about 1963 with an Omega cal. 550 movement. Is it true that this can be wound using either automatic or manual wind? Will the manual wind have any negative effect on the watch?
To directly answer your question, manual winding has no adverse effect. The movement is designed to be wound either way, though I'm lazy and will tend to wind just a few turns to start the movement and let wrist action continue to wind the movement through the day.
Winding the watch less than fully could conceivably result in timekeeping errors as the watch gets older, the mainspring weakens with age and loses isochronous characteristics, but it has no significant physical effect on the life of the movement.
BTW, these questions get answered much faster on the eBay Watch & Clock Discussion Board (http://forums.ebay.com/db1/forum.jspa?forumID=2014) than in Neighborhoods. MUCH more traffic and lots of Omega collectors there.
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