On a chain like this I would first hit it with PB-Blaster. Then hit it with Automatic Transmission Fluid (ATF). Then hit it with motor oil. Then see what's left...
As a matter of fact I would probably coat the entire bike with ATF then wipe it clean and see what I got...
But that's just me...
Nice Bike!
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No matter where you're at... There you are... Δf:=f(1/2)-f(-1/2)