Rolex Daytona Ref 16523 Inverted 6.
It is done on purpose and there is few samples having inverted 6 in the market on Daytonas.
Two Tone, Stainless steel and solid gold...etc.
It was just a simple font change nothing more nothing less much like the many over the past 40 odd years. the Internet hype will drive prices up to those who will pay, and believe they will become more collectible!
If you are collector, or you are end user looking for a Special Daytona. Check for this!
A Daytona Ref 16528 solid gold Inverted "6" drop logo is about HK$200,000
A Daytona Ref 16523 half gold Inverted "6" is about HK$100,000
A Daytona Ref 16520 Inverted "6" drop logo Stainless steel
is about HK$500,000!!
Price about is just for your reference only, as prices may vary on whether if there is paper and box and condition of the watch.