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I think the Bergeon winder sizes go up from 12mm (#8) to 19mm (#15) in 1mm steps.
The ones I can be sure about are #8 (12mm), #11 (15mm), #13 (17mm), and #15 (19mm) as I have measured my own #11 and #13, and I have found the #8 and #15 sizes on Cousins web site. The others I have inferred as they seem to fit a logical sequence.
#00 to #7 are a little less obvious. They can be found on Cousins site if you need them but as you are enquiring about pocket watches I assume you're mainly interested in the larger sizes.
The sizes refer to the outside diameter of the winder drum so to work out the correct size winder for a given barrel you need to measure the inside diameter of the barrel and select the largest winder that will fit inside it. This will then ensure that when you insert the wound spring it is fully inside the barrel when it releases from the winder.
Individual winder barrels do crop up from time to time on eBay and other online sellers so it's well worth keeping an eye out for them.
Hope this is of some help.