Very cool John. I would have kept that. Did you buy it specifically because it had your birthday stamped inside or did you find that out later?
I only found out later after I had a chance to take the drums apart for detailing. The kit now belongs to Mike Layton and oddly enough, his wife Anna and I were born on the same day! So it's still a birthday drum!
If it had been the exact day, month and year of my birth, I would have kept them. :D
John