Bezel and lugs are still nice and sharp and the double-finish dial indicates earlier model within the first couple of years production. Note the crossed t in Constellation: that is an indicator of the earlier dials. Guilloche centre is beautiful and coupled with its early production, the fact that it is stainless steel, and the having a black guilloche dial, this piece is decidedly uncommon.
I expect your case number is either 2652 (probably) or 2782. While the beads of rice bracelets didnt come along until 1959, I think your SS model looks great on a BOR.
Any questions, just fire away, as there are a number of forum contributors who are well versed in these models.
Cheers
Desmond