It’s the correct crown but the gold plating is very worn. The ‘clover’ crowns were still available from Omega when I needed one about 5 years ago but not sure these days. Shouldn’t be too difficult to source one.
And, regarding your original query, the Connie is really only fit for slingshot ammunition. The Seamaster looks alright to me with a new crown and a service. 600 quid seems slightly ambitious.
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