Mail in service for vintage Speedy

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Wondering if anyone could recommend someone could service my 1998 3570.50 (tritium dial, 1861, 1499/842)? I bought it three years ago (service history unknown) and my local trusted watchmaker here in Columbia, SC says he doesn’t do chronos anymore bc the parts are too difficult to obtain. Any recs would be greatly appreciated. Thanks!
 
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Nesbit's in Seattle did my 1973 Speedmaster with no issues a couple of years ago. Omega parts account.