Rolex GMT 1675 1960 - seeking advice

[ClaudiusAD]

Hi All,
I was offered a Rolex GMT 1675 with box+documents (dated 1960), the S/N is 504xxx , but after some research at gmtmaster1675, I'm wondering if it could have been serviced. It seems to me in a bit too good condition, with few signs of wear... Also, the"8s" appear rounded, instead of oval, and this could indicate a serviced part. So I thought about asking for the opinion of you more experienced guys: maybe the picture could bring some light... thanks in advance.