Plus, it looks like you got 2 lefts and a right! Those fools.

The two on the right just look faded and worn. Are you saying all three are new?

If they were different when new then it likely has to do with what threads were available at the time of production.

I have pretty much only black socks to make pairing easy, and if I detect loose strings or it getting thin that sock is gone. Socks are like a dollar and I’m not about to ruin my day with a holey sock.