Chain tensioning washers?

[rustyjones]

Does anyone recognize these washers? Looks like they would be for tensioning a chain? Thought I saw some similar on a National

 

[fordmike65]

Nice! Tough to find since many frames are missing them.

@Jesse McCauley

 

[Rambler]

Does anyone recognize these washers? Looks like they would be for tensioning a chain? Thought I saw some similar on a National

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View attachment 1476925

Rustyjones, Yes, they are National chain tensioning washers you have pictured there. The spirals are opposite each other (right/left) one for each side of the bike. If you are selling these washers I am interested or if you have questions about a National Cycle you may own I can probably answer them. Tyson