Watch - an everyday time piece is essential to a grown man's wardrobe, and no your cellphone will not work. The kind of watch that you should look for is a durable, well made watch and if you have the cash make it one that will last 30+ years. An everyday watch needs to be able to make the transition from a suit to jeans to a casual Saturday to a date. This is the kind of watch Steve McQueen, JFK or Frank Sinatra would have worn. A classic elegant time piece that has enough bulk to be noticeable, but not so much bulk as to look awkward.
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