If it's a 1970 press, would guess it was aimed at sales in east L.A. Ady. Don't forget that area had taken this sound as 'their' sound at that time. Look at the output from Memory Pain, Good Old Gold, Groovey Disc, Lost Nite, etc. Re-issuing (booting) sounds from the 50's/60's for the Latino population in E.L.A. It also fitted in with the Low Rider scene.
You can sometimes pick up these records, mint old stock, in record shops in that area as it's still popular there today. I will never forget the first time I stayed at a mates place down Whittier Blvd a few years back, we sat in his back yard late on a Friday night & the air was filled with the sounds of group ballads from the likes of Thee Midniters, then the occasional 'crack, crack', followed by me saying "oh, someones got some fireworks!" But Sunday night was dead quiet, they're a religious lot !