Please read this from Select 45 :
Don't know how accurate it is, but it starts:
"Buying Vinyl today, you really do need to be sure you are actually buying the Original"
Original Pressings Info
Original Pressings Info
"Stereo added to a label of older music often means a 70s press especially if the music is playing in Mono, look at your yellow Epic copy of Vibrations 'Cause You're Mine' with Stereo added & then you'll see it's an early 70s press, not the 1969 one which had narrower & smaller typeface! Stereo 45s do exist from 1958, but will be easily proved originals from other factors."
Mick