This is a Guardsman (Detex) Security Watch Clock Station With The Key.  It is in good used condition, and I haven't tried to clean it.  It is approximately 3-5/8" x 1-5/8" x 2-3/8".  Please see photo and email me if you have any questions, thank you!

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I have many more great items listed on eBay and also in my eBay store - wendysworld - that are available for immediate purchase - please take a look!