By "parts" I suspect you meant the indexes on the dial?
These will not be available as spare parts and the only solution is to either find a donor dial or donor watch, or a replacement dial.
The model is just an "Omega" designated "2620". Before Seamaster/Genève/Constellation there were no specific model names, with the exception of specific issues like Centenary and earlier vintage models, Foibos, Arctos etc.
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