i allways thought that too, 'stemmons' may not be but the label is out of california. i read somewhere a few years ago that an early incarnation of Fleetwood Mac also had a 45 out of the label, recorded and released in Calif. it also said that 'stemmons' came out at about the same time 1968/69 which puts it after the Precisions.
I can't find the article right now, but found the 45 on popsike (pete, if that's the one you got it went for $800 a few years ago), the label number has rubbed off my Stemmons 45 so cant see if it came before or after the 'fleetwood' one.