Those two items are on Mark's list as Q4 and also the Harrison Tape Guide posted elsewhere lists them available for sale. However I have never seen them anywhere as a Q4 - not on eBay and not in any collection I had the chance to see. Of course the LPs and the Q8 are around. But has anybody the Q4 or can confirm its existence?
Most of the other CTI Q4s are quite common.
Most of the other CTI Q4s are quite common.