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1950's SIDUNA A/S (DK) Ref. 17553 Dress Watch SN#125930 – 17j MW FHF Cal. 28 – Localtime Watches, Straps & Accessories
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Vintage Eye for the Modern Guy: Siduna M3440 Professional Uni-Compax Chronograph | WatchTime - USA's No.1 Watch Magazine
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The Siduna Expedition Chronograph collection, a Swiss powered mechanical chronograph 89% Made in Europe
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