Looks quite tidy. Movement is clean and the lugs still have a sharp chamfer. Dial is original. So I think in today's market you did fine at the price you paid. Even though seller claims the watch has been serviced, I would be inclined to get a good independent watchmaker to have a look at the movement to see if oil is in the right places.
Usually if the balance jewel is oiled it's a fair bet that the watch has been serviced.
Cheers
Desmond
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