I have not seen any SQ 7" records. I have only seen discs marked QS or quadraphonic, which I take to mean EV4 from before QS was officially adopted. Even the Japanese singles and EPs seem to be QS.
I have about 28 EP`s and most of them are QS some are (demo disc`s. not for sale) these run at 45rpm.
The one`s that are SQ are mostly Simon & Garfunkel I have 5 off. Here is a small sample of them these EP`s run at 331/3rpm.
Sorry rustyandi I should have read your post better.
I have only one project3 EP and its QS I have not seen any SQ project3 EP 7" in my travels on eBay or the Japanese sites these are very hard to come by for a collector and when they do come up there price is sky hi. have a look at this seller.