I saw only styrene copies of that record with the Monarch delta back when the record was out. That was the West Coast pressing. But, in The Midwest and East, most likely, the pressings were vinyl. But, they, of course, wouldn't have had a delta on them. Monarch DID press some records on vinyl. But, I tyhought that started in the 1970s. I don't remember any vinyl records from Monarch during the '60s (or, at least before 1969. So, I don't believe this record would have been pressed by Monarc onto vinyl. So, the vinyl King Errison record is suspect.
Does anyone here know wxactly when Monarch started pressing vinyl records?