Hello, Timcampbell82 -
I have tried to find a user's manual for a Rosieres F200T oven for you. I suspect the user's manual states what temperature each of the numbers for the degree knob represent.
So far, I have not found a manual online for you. I did find an online forum in French, with mention of a manual for the oven model, but the messages date from 2008:
https://www.meilleurduchef.com/fr/forum/notice_materiel/1225015073-14054-650
You may wish to locate a business in your area which performs repairs for Rosieres ovens and ask if they can find a manual you can purchase for your model oven. Or, perhaps one of the repair technicians can tell you what temperature each number represents.
Best wishes.
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