Help! Need a crown for a watch I inherited

The watch needs a service. The case back seal has turned to black goop, so this would indicate it’s been a very long time since it was last serviced.

The crown you will need is 069SX42044.

Yes there are many recommendations depending on what country you are in. Try the search function.

Why not let the qualified watchmaker source the parts and service the watch?

Customer supplied parts can be a bit difficult issue sometimes. If your watchmaker is providing a warranty, should he warrant the water resistance using a crown that came from the customer, with an unknown origin or age? Most will not.

For this very reason, many watchmakers will not use customer supplied parts, and often they can get the parts cheaper than the watch owner can, particularly in this case where they may have a parts account with Omega. This way they know how old the part is (Omega puts the production date on the packages) and they know they are getting genuine parts. It's unlikely that someone would go to the trouble to fake this particular crown, but I have seen fake parts for more popular watches. We all know of the fake SM300 parts, the fake SM120 parts, and I have personally had a Speedmaster come in with fake pushers on it.