It should be a slip of paper like this:
View attachment 862804
This is a printout from a dry testing machine. My gut tells me that if the machine he has only goes to 6 bar, and he didn't give you a printout, he's probably using an older technology machine like this:
View attachment 862805
This has a max. pressure of 6 bar...
If the watch was being fully tested to Omega specs, it would have been tested in a dry pressure testing machine using both vacuum and pressure (-0.7 bar and +10 bar respectively) and then placed in a high pressure wet testing machine, and tested to 125% of the rated pressure, so in this case 37.5 bar or approx. 375 meters.
The full procedure on a different watch is outlined in this thread:
https://omegaforums.net/threads/pressure-testing-a-watchco-sm300.45375/
Note that this equipment costs a good deal of money, so not every independent shop will have it, but if they are certified by Omega it is required equipment. Just to give a sense of costs, the Bergeon tester that goes to 6 bar costs about $800 US or so. The combined cost of the dry tester and high pressure wet testing equipment I use is 10+ times that number.
This is why you need to have a full discussion of the scope of work before you hand the watch over. Not all service is done to the same level, so understanding what the shop is actually going to do is important.
Cheers, Al
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