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1973 Seiko Bell-matic 4006-6027. Bell-matics aren't that rare, but mine is in pretty rare condition. : r/Seiko
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The only Seiko mechanical alarm watch: Bell-Matic 4006-7010 27 Jewels – Ding-a-ling-a-ling!!! | musingsofawatchaddict
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Vintage Seiko Bell-Matic 4006-6040 Original Bracelet - Toronto Vintage Watches - Vintage Seiko passion
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