This 24 track CD produced by Ace in 1997 includes all of the tracks record prior to Simon signing with Monument's Sound Stage 7 label. the material was recorded between 1960 and 1965 and were issued on small labels like Hush, Gee Bee, and Irral, as well as being picked up for National distribution on Dot and Vee Jay. Amazingly, 13 of the tracks are in stereo(!), including "My Adorable One" which sounded crummy and weird on the Vee Jay boxset.
You can divide Simon's career into three sections; the Hush/Duane era (presented here), the Sound Stage 7 period and the Spring period.
This is the best sounding and most complete collection of that early period. Worth buying!