We get two close-up shots of Magnum's driving license during this episode.
It reads (with a photo in the top right corner):
STATE OF HAWAII
546 10 8740 (social security number)
Magnum Thom Sull
11435 18th Ave
Honolulu HI 46816 0 2 3
3RN 6-04. BI M N 1/05/46
It's not clear whether the date (1/05/46), is his birthday or not. If it is, there is contradicting dates given in several later episodes.