Let me add to that: The "Sample Pressing" shown on those labels {Images #1025831 & 1025832} is in Arial Bold - a font that clearly did not exist in the 1930's. Nor did Arial Black which was used for title and artist.
And any label with "Columbia Recording Corporation" would have been pressed between 1939 and 1947 - the year the corporate name changed to "Columbia Records, Inc."
FYI
Vocalion was operated by ARC American Record Corporation up until Dec 17 1938, the day it was sold to CBS. On May 27 1939 CBS incorporated Columbia Recording Corporation. It did not exist before that date. The company ARC owned, and sold to CBS was Columbia Phonograph Company, Inc. So that disc was not made in 1936.
"This test pressing was not made in 1937 either" I don't doubt the recording date, it was just pressed years later.
"Phonograph Blues" was actually recorded in 1936 (two takes, SA-2587-1 and SA-2587-2) but not issued on a 78 rpm record in 1937 or anytime. The first take was first issued on the King Of The Delta Blues Singers Vol. II LP in 1970 (Columbia 30034), the second take on The Complete Recordings double CD in 1990 (Columbia 46222). This test pressing was not made in 1937 either, it was not produced before the late 1950s, see http://collectorsfrenzy.com/details/320336253265:
Here's your chance to own a piece of music history. This auction is for a test pressing of Robert Johnson's "Phonograph Blues". This was part of a group of test pressings that was originally made for Columbia producer Frank Driggs in the late 1950's or early 1960's, when Columbia was considering the reissue of some of its back catalog of country and blues recordings. Shortly afterward, Columbia and most other record companies abandoned their old stamping equipment, thus halting the production of such test pressings.
Based on the pressed matrix numbers (Compared to the original Vocalion issues), "Phonograph Blues" was originally recorded in San Antonio, Texas on November 23, 1936. From these recordings Driggs produced the first reissue anthology of Johnson's recordings, "King of the Delta Blues" in 1961 - an album that proved to be the most influential album for modern popular groups including the Rolling Stones, Cream and Led Zeppelin. Johnson's recorded repertoire consisted of only 29 songs, which he produced in 1936 and 1937, five of which were never issued during his short lifetime.
I purchased two of these test pressings from an auction house. ... This disc was previously part of Heritage Auctions "Good Rocking Tonight" collection.