It is the buyers responsibility to examine all items to determine if an item is safe for use The buyer accepts all responsibility for use of items purchased
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Here is a great restoration item - an Everest black chain for wide 5sp or wide 6sp freewheels. This looks like a chain that would be happy on a 50's, 60's, or early 70's bike. Everest was an alternative to Regina. Some high end builders (such as Masi) seem to have prefered them on their bikes instead of Regina.