What is this black box on the seat tube?

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Salty seadog

Space Cadet...(3rd Class...)
I've seen them around mostly on older bikes. Is it a lock fitting, I have never seen a cable or anything. A tool kit?

Over to you....

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southcoast

Über Member
Don’t know what that is, but the chain needs some oil.
 

midlife

Guru
Brown bike behind looks like a Raleigh Esquire.....
 
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