Side indicators appeared on Brunswick labels attached with a hyphen to the catalog numbers only until December 1948, so Redpunk's copy is the original one. The other two, without any side indicator, must both be from 1949 because of the CT tax code (in force April 9, 1948 - December 31, 1949). I'm not sure, however, why they don't list A & B above the catalog number, like other Brunswick labels between 1949 and May/June 1950.
This was reviewed in the December 1948 issue of The Gramophone, so I suggest the date is changed to that, agreeing with the Missing Charts book (which does indeed have errors, but this is not one of them!). [Thanks, reference added and date corrected. Mod.]
Brunswick seem to have made a habit of releasing records out of catalogue order, and especially so from 1948-1949. Records with cat nos. from 04100 to 04237 seem to have been pre-allocated to artists in batches (e.g. 04108-04137 are all Bing Crosby records), which were then gradually released between Oct '48 and Aug '49. This ran in parallel with the standard releases (which were roughly in numerical order from 03945-04099). This confusion continues to the end of 1949, when a 'special' Brunswick release of 86 records was provided to dealers, these filling in the gaps in the subsequent releases from 04282 to roughly 04400. The Gramophone speculates that this was due to contractual obligations to the American Decca company.