Oh yeah, theres a flow-restrictor all right-------------
One of the first vintage machines I collected was a 1968 SQ. Due to the old plumbing in my nearly 100 year old house, my water pressure is somewhat low. When set to "extra fill" the tub JUST did fill up for the wash, but only made it about half way for the rinse. So I took the water valve apart and removed the tiny flow restrictor. From that point on the machine worked great----although I did waste some water on the wash fill.
Severl months later, a friend nearby, who greatly admired the machine bought it from me. He has GREAT water pressure. Well, when we started her up the water FLEW in!!!!! It came in so fast it actually backed up in the flume!!!!! When set at the low setting the tub filled up and overflowed just before agitation began! Oh, and talk about an overflow rinse-----it must have changed the water in that tub three times over for the rinse cycle!!!! A VERY through rinse indeed!
Needless to say we had to back off the water valves at the faucet. I offered to go get another flow restrictor to put back in the water valve but my friend would have none of that-----he loves the overflow capability.
Anyway, it was a good learning expierence for me as far as the importance of flow-restrictors are concerned. Recently I removed them from my 1968 "Gold Crown" "Roller-matic" and it sure did make a difference in how well it filled up.(Timed fill machines can be a real pain if you have low pressure!) Just like the SQ before it, it fills right up to the top for the wash and almost to the top for the rinse.
Love those old SQ's though, and that Coppertone color is really nice too. Should clean up beautifully.I know you'll love having it!