Hello, I came across this KTU like circuit, with "120C IU" stamped on the edge. It looked like it was designed for the 1A2 modular panel, where it would take 2 slots. I couldn't locate it in any of the BSPs I have for modular panels. Is this card for a 1A2 system? Thanks for checking

Any chance of getting a picture? The reason I ask is that Teltone and Tone Commander made versions of intercom cards designed to be replacements for WE 407B, 424C and 494A intercom cards. Perhaps it's one of those?

Check out eBay item number: 223085200122

Still checking a couple of my favorite sites (besides here):


https://catalog.spmh.us/

https://www.telephonecollectors.info/