So I have checked and confirm that dials are interchangeable on the 620 and 625 calibers. The 620 have dial screws, even if not all the 625 actually use it, and the 620 does not have dial screws - so the dial can only be press fitted into the movement.
A few pics below - sorry for the poor quality. Note that the movements are not in working condition and that the 620 is lacking the incabloc on the balance cock. But you can see what we are talking about here. The movement with dial (second and third pics) could actually be usefull for you - but you should check the caliber and le size of the dial first. I am not selling that, but if it is the correct dial for your watch, I would be happy to give you the dial - and the mouvement if you need parts. You would just have to pay the shipping costs and show us some pics!
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