It's from 1967 .I have the NOS set that goes with it.Average used, working condition, about $50.
New are right at $200.
If I were buying a NOS pedal to complete a period correct kit I might go $200.
If I were buying a SK to use as my player, I would buy a solid used $50 pedal and service it (if needed) to my own satisfaction.
I think NOS in this case is a tough sell, small market share, especially since they make a near look-alike new, with a warranty.
Do you know how old the pedal is? Interwebs says made between 1958 - 2000. This might help you for that person looking for the perfect match for their vintage kit.
Is there any documentation/paperwork in the box that makes this a complete NOS time capsule? Maybe even a receipt?