No DS but it is from ca 1959-60 so the same time period. 20 Micron Gold plate with a rare 23-20 caliber (at least here in Sweden). The crown looks to be a more modern replacement but in general not bad looking for a plated watch.
No, not at all. A crown is a part that wears out and watchmakers just put on a new crowns that they had in stock. As it has the newer Certina logo a crown with that logo is preferable but a period correct crown would do as well. Gold Certina crown are hard to find nowadays so you take what you can get.
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