Thank you, Mike Gann, for editing the notes. In addition, I propose removing the release month. As said, the ARC budget label records were reissued on Vocalion "starting in April 1938", so we can't be sure about the exact month, just like for all those 1940 OKeh reissues of previous Vocalion numbers.
You're right, han enderman. Vocalion 2830 by Bing Crosby is a reuse of the previous number 02830, not the other way around. The two Crosby sides, originally recorded for Brunswick, were previously coupled like this on Melotone M 13132 in 1934. There are more Bing Crosby reissues on Vocalion, even using the same old unprefixed numbers: 2834, 2835, 2845, 2867, 2868, 2869, 2870, 2877, 2878, 2879 (of these, only 2867 had a prefix counterpart).
Vocalion - the lowest reused number appears to be 2830 (see ODP), but the reuse does not have the 0-prefix as it is not a country or blues recording. Number 02847 for Clyde McCoy is an error; the number on label is 2847, but these later issues can be easily recognized by the label type and by not having A/B sides (but you need a label image). Last known issue with A/B sides is 03051 (Blind Willie Johnson's Take Your Burden).
Against Mike Gann's notes, this record was not originally issued on Vocalion and reissued on Melotone. In fact, Blind Boy Fuller's first 25 singles until April 1938 were all (except two for Decca) released on ARC budget labels, mostly Melotone and Perfect, see his singles discography on RYM that I have sorted out some years ago. It was not before May 1938 that Fuller's singles were issued and reissued on Vocalion.
See our Vocalion biography that xiphophilos once made with my help: Starting in April 1938, after ARC had stopped issuing its budget labels Banner, Conqueror, Melotone, Perfect, Oriole, and Romeo, it reissued some of these releases on Vocalion. To do that, it created new catalog numbers by reusing old numbers of popular records that had not yet been issued with a 0-prefix and adding a "0" to them. The first reused number appears to be 2847, the last one 3499. Most of these Vocalion reissues were records by Blind Boy Fuller and Gene Autry, in addition to others, e.g., by Big Bill Broonzy, Patsy Montana, and the Carter Family.