Fair enough guys - as I said this is a very odd one.
I'll post some pointers, and if that doesn't help I'll put up the answer!
SOME CRAP POINTERS:
1. This watch is relevant to how the job is done in the UK, US and Australia. Other countries may not do it like this, so could be a bit unfair! (Maybe they do, maybe they don't - I only know for sure in these countries)
2. The watch movement is regular quartz i.e. one rotation of hour hand is one hour
3. The hour hand performs no function, only the minute hand. So the markers refer to tenths of an hour (how many minutes?)
4. More often people with this job would use a stopwatch (or stopwatch function on regular watch), a chess clock, computer software, or just use their head to work out the function this watch provides.
5. It allows people to change the fabric of time! (Joke!) It means they can create hours where there were none. It is possible to do (for example) 27 hours work in one day with this watch. Why would somebody want to do this?
6. Final clue. Think money, money, money.
Best of luck!!