The 300M Mid-Size SeaMaster Chronometer was in production from 1993 until 2004. you're buying a ~15 years old watch.
Mom needs a reliable watch.
2 points to remember:
1. look for the overall condition, look for a non polished watch etc
2. you must send it for a service to start with 0 on the clock and water seal.
unless watch comes with fully documented, printed Omega service receipt, I would any seller quoting that "my watchmaker serviced it" with many grains of salt....
take all into pricing consideration.
good luck
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