Discovered I had a One Step pressing....from 1978!

STC records apparently discovered one step pressings in 1978. The cover (see attached images) touts “introducing the Direct Pressed Disc. One step closer than direct cut.”
Anyone know of other one step pressings previous to the current MoFi’s?

https://i.imgur.com/R9OgEQI.jpg

https://i.imgur.com/pfL8mAJ.jpg