This unwrapped penny-candy size is the most common Magic Photo wrapper and includes developing instructions. Most kids would've use spit and sunlight.
Topps used "Bubbles, Inc." as a corporate alias several times in its history, so it's no surprise to see it here. While their initial checklist (and album) held 126 cards, Topps released a second series in 1949 for a total set size of 252, and many cards feature variations depending on how they were packaged. (Read "Presto!" at The Topps Archives for much more.)
My #5 type card is HOF Indians player-manager, Lou Boudreau, crossing the plate.
In 1948, Boudreau won 1948 AL MVP for his playing skills and managed Cleveland to the World Series championship over Boston's Braves. Not sure if it played into the set numbering, but Lou wore #5, now retired by Cleveland.
The card front answers this question: Cleveland won the game, 4-1. As noted by Wikipedia, this also marked the first live TV broadcast on a moving train.
"K" is Magic Photo's baseball subset; I borrowed the full list from Topps Archive.
- A Boxing Champions
- B All American Basketball
- C All American Football
- D Wrestling Champions
- E Track and Field Champions
- F Stars of Stage And Screen
- G American Dogs
- H General Sports
- [Series I not used]
- J Movie Stars
- K Baseball Hall Of Fame
- L Aviation Pioneers
- M Famous Landmarks
- N American Inventors
- O American Military Leaders
- P American Explorers
- Q Basketball Thrills
- R Football Thrills
- S Figures Of The Wild West
- T General Sports
For subset comparison, here's American Dogs #5.
UPDATE: Topps also created a storage album with checklists for the full series, scans from this eBay listing.
|1948-49 Hocus Focus Album (cover)|
|1948-49 Hocus Focus Album Checklist (A-G)|
Their second checklist is typeset differently as the "New Series of 126 Hocus Focus Photos," so an earlier version with just series A-G might also exist.
|1948-49 Hocus Focus Album Checklist (H-T)|
Topps would return to this Hocus Focus format for another two-part series in 1955 and 1956; that set's #5 is Ted Williams.
Value: Clear, full images command better prices in the marketplace. I bought this Lou Boudreau for $10 on eBay several years ago and type cards remain in that range. (Bigger names in baseball and football cost several times that.)
Fakes / reprints: It'd be challenging but not impossible to fake this set expertly, so it's worth sticking with well-known dealers if you plan to buy big names.