Just guessing based on your description…Audio note DAC zero? They specialize in limited inputs and kits are/were available. Perhaps you saw a custom build?
Please, what DAC is this?
I'm daft and unable to attach photos from my library. Arrgghh!!!
DAC is small shoebox, polished stainless steel with large shrift Zorro like Z slashed through DAC-1 on the end cap. I thought it to be an Audio Mirror NOS, but cannot correlate through research. BNC only.
Thank you. Cheers