JC
All prints of Mac's St Andrews plan have 1924 on them, regardless if they were printed in 1924 or last year. One of the ways of telling original early prints from later ones is that the early ones did not have the 10th hole renamed "Bobby Jones", it was just called "Tenth". The early one is depicted in the endpapers of Robert Hunter's The Links.
Its hard to tell from the image on the auction page as to whether it is post or pre-Jones, but I think I can make out the name "Tenth" in the card which tells me its an early version. If so that's a pretty good price.