I ran across this on ebay, it's very cool and would look great with a Marantz Unit but $120.00 USD is a little too much for me; I'm posting this for historical value since these calibration tapes are always super rare and tend to go for big money. https://www.ebay.com/itm/VINTAGE-MA...136925?hash=item1ca3f9bb5d:g:UgYAAOSwlxRaeh1m
It looks as a good calibration tape, but woh knows how much has been used? I wouldn't trust in old calibration tapes, as they could have lost some signal, and that would made them useless. I recommend a new one from ANT Audio. They made a mix tape that combines signals for playback, dolby, speed, etc... I have one and works perfectly.
