OMG! I can't believe I never noticed that before! At least I can claim that TZ-UK members have been complicit, as I have been sharing these photos for the past 21 months without comment!
It's an interesting watch made even more interesting :)
QC fail is my guess, as I bought it new from a respected dealer.
I quite like the idea that it's not meant to be like that but it's passed all the way through the system without being detected. Did you buy it realising the mistake?