That site is indeed really useful, I used it a lot when I was trying to figure out the age of my own early 70s Jazz. It’s clearly not an exact science, mine has pots from late 73, is 4 bolt, with a case that came in in 74, long G bridge screw, I’ve just settled on somewhere around 73/74. 😅
The date that site gives for 3 bolts on a jazz is late 73.