Weird, Never seen that. They appear to be a match, same date code and everything. Could it be some sort of UV exposure yellowing or something?
What do you want for weyless (or whatever they are) type skewers? haha
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1 Super Record bike, 1 Nuovo Record bike, 1 Pista, 1 Road, 1 Cyclocross/Allrounder, 1 MTB, 1 Touring, 1 Fixed gear