The product is a ST-69-21 FHF 60-21/FEF 6664 movement part, specifically a balance completel part 721N NOS. It is manufactured by the brand ST 96-4 in Switzerland and is compatible with Certina watches, specifically the Certina DS 2 Certiday model. This part is crucial for the proper functioning of the watch movement and is a genuine part from the Swiss watchmaking industry.
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