In my opinion, treat your modern watches the same as modern cars. Use, service regularly and accept they may go up or down in value. Replace any internal parts on your watches with manufacturers parts and try not to replace the exterior parts. So, a new barrel is not an issue but try not to replace the hands unless you have to.
My feeling is that you should enjoy these things for what they are - it seems unlikely that any are particularly rare or irreplaceable so they should be used as intended. If you are thinking about how the value might increase in a few years then you're probably hoping for something that won't happen and it could affect the way you use them now, which would be a real shame. These things should be enjoyed and I've never thought about how the value of my 1997 Speedmaster (for example) might be affected by using it.
@chipsotoole - What parts are missing from your Omega 1481? I think most parts are easily available.
Cheers, Chris
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