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You have a keen eye 8)
I'm actually a bit surprised that no-one has commented on that earlier.
Yes, they are threaded the "wrong" way but that's on purpose.
I like them that way.
Swedish Mustang
I had one of these in light blue for a while in 1984-85:
It's a Mustang Aero Apex 600. Though Mustang is a Swedish brand and at that time had their own factory in Sweden,
this model was built by C.Itoh of Japan. Tange tubing with aero down- and seat tubes.
Components were...
If you'll be running on hard surfaces like asphalt or concrete, grooves won't help in the wet. Tread only helps if the tyre can dig into the surface it is rolling on. Bikes don't aquaplane.