Help Verifying 5015 Bubbleback!

[YSI]

Hi everyone,

I found what ostensibly is an old 5015 bubbleback at an antique store, but I am not familiar enough with vintage Rolex watches to verify this. I have noticed that the serial number on the case is "683504," while other similar models used a case with serial #s "545383." Also was unable to get the case back open to verify the movement. Any insight into the veracity of this watch would be much appreciated! Also worth noting that it has a "Super Oyster" crown (unsure if that is helpful). Thank you!