Very nice collection ! No seal melt on mine, just minimal wear on the very edge of the dial where its presumably been in contact with the seal/plexi over the years. After purchase I found that mine just had an old o-ring stretched round the dial rather than an original type seal, so I fitted a seal from Jurgens. Does anyone know whether melt can still be an issue even with new seals, or did it just result from the material used in the originals ?...