Happy birthday Model 59!
Weird thing is closest one I have to your serial is
Serial A360615 but it Shipped Sept 1976,
Also have a
Model 39-2 Nickel,
Serial A441900 Shipped July 1978.
Model 39-2 Serial A489544 Shipped April 1979.
And Model 59 Nickel, Serial A626220 Shipped Dec 1980.
I'm guessing you are basing its DOB by the stamp in the box, would be interesting to see when the factory shows it shipping to compare.