1957 14K Datejust With Rare Dial - Forgot I Had It (LOL) - Clearly Clueless - Help

[speedolex]

Pathetic though it may sound, I was once big into Rolex collecting a decade and-a-half ago, the wife insisted we have 3 more kids, and I've been a busy father for quite awhile. First one is off to college and the others are in school so I finally have a chance to breathe and pick back up on a few hobbies I once loved. Such is horology I guess.

I went through some old boxes I'd never opened after our move back to the NYC area the other day while looking for a Rolex clasp and came across this 1957 14K Datejust which I completely forgot I had (does this happen to anyone else?) which makes me feel really stupid but it's what it is. I bought it off of a reputable seller found in the TZ forums back in the day, don't remember who right now. Sunken pie-pan dial, arrowhead markers, 6605 classic.

I did a little Google searching yesterday and it appears it has a rare dial with the message "Superlative Chronometer By Official Test" which years ago some thought was either the very first production run or perhaps a prototype. A watch similar to this with a black dial and no bracelet(s) sold for a hefty sum at auction.

It has 2 bracelets, one marked 750 which is on the watch and the other marked 8385 which came with the watch originally and is a 14K President I had restored by Classic Watch Repair in Hong Kong years ago. I put up photos of each.

If anyone can help me understand what I've got here I'd appreciate it. Promise, I won't forget this time.