Well, in part because it’s mono and vinyl but a lot of the credit has to go to John Pfieffer as producer and John Crawford as engineer. Both were talented musicians as well as experienced engineers. Pfieffer later developed stereo and quadrophonic processes for RCA.
Except that anything labeled "LSC" is not mono, but stereo as stated in large letters "Living Stereo". Mono's are labeled "LM".
I can't seem to put my fingers on my RCA guide right now, but Crawford was one of a group of star engineers for RCA, just a tad less consistent than John Leyton and Kenneth Wilkinson. All these guys had hits and misses, but these three were probably the best of the bunch.
This is a hard LP to find... none available at Discogs, and nothing currently or in the "sold" history at Ebay. I'll have to do some watching to find a copy.
Hmmm, after a bit of searching I see why there are few for sale... prices are $150+
But as Throwback observed, I"ve also found that the original shaded dog and white dog pressings to be superior to their "Classic" or other repressings.