139 mm slotted QR axle seems pretty long for a hollow axle of this age but I am most convinced it’s a factory spec by the 18 mm drive side spacer as there would be no way to reconfigure it to a shorter length without using another part, it also matches the outside diameter and finish of the left side spacer. I would excpect that if it were something someone put together for a newer machine it would have a stack of multiple spacers. The other thing that makes me think this unlikely is that it was built into a 27” wheel.
More pictures as it appears I had left out the left side spacer in the first post, I removed the axle to inspect the bearings. The axle is not bent and an even in its dumpster fresh as found condition the bearings felt smooth as butter. I will certainly be building this into a wheel for something, the long axle would make this a good candidate for a zero dish wheel.
