The story mentions he found the 78 at the Jazz Record Mart about 35 years ago. I got my copy (and a bunch of original Prestige pressings) when I worked there in '66/67. When the local Prestige distributor phased out his 78 inventory, Bob bought the lot.
The Discogs entry (* New Jazz 855 Lee Konitz - Duet For Saxophone And Guitar / Yesterdays / * Prestige 755 Lee Konitz - Duet For Saxophone And Guitar / Yesterdays) is incorrect. These recordings have nothing to do with the "Duet" session.