Sounds like a lower model line of calipers from the late 80-early 90s. Sucks when dealing with slimy CL sellers. But +1 on posting pics to assist determining what these are and reselling them to acquire your period correct Nuovo Record calipers.

edit;
just read that these are SR calipers....maybe someone else will be interested in a trade for their NR calipers. A consideration.

A lesson learned....I did similar years ago, sent my wife to buy a Ti mtb frame. She couldn't tell that the frame had repair damage. Seller didn't disclose anything....threw in a set of wheels when she called me first, to sweeten the deal. I discovered the frame is useless....expensive set of used wheels.