As X350XJR says, without a screw down crown you are always at risk. You should have it tested regularly for water resistance and not operate the pushers or crown in the water, but what's strange is that this mail seems to contradict the data on the Omega website:
http://www.omegawatches.com/fileadmin/customer_service/WaterResist.pdf
Anyway, you have a lovely new Seamaster now so, best of both worlds.
Cheers, Chris
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