I love mechanical watches and wear one daily. I find them to be very practical and not at all "just jewelry." In law, we bill in six minute increments (tenths of an hour) so keeping track of time is of the utmost importance, plus it's much more discreet in the midst of a meeting to glance down at your watch rather than pulling out your phone to check the time. As on occasional issue, some judges do not allow anyone other than court personnel to bring electronics into their court rooms, so watches are always handy on court dates. I also rely pretty heavily on the "date" function when signing documents (or instructing clients to sign).
This Seiko has been my daily weekday office watch for the past several years. I have a nicer watch in mind that I intend to pick up at some point, but have had a hard time convincing myself to shell out the dough when I am so happy with this one:
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Here is a 7-jewel hand wound Elgin made in the 1920's that I wear once in a while. It keeps great time for how old it is, and of course it was recently serviced, so it is in tip top mechanical condition. It runs about a minute or so fast by the end of the work day after winding it up in the morning - better fast than slow.
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I've got several others as well. I'm wearing the Seiko today so I snapped a pic, and just happened to have a picture of the Elgin on my phone.