4. Set Profile: 1947 W602 Sports Exchange Baseball Miniatures
These "Sports Exchange" cards were distributed by The Trading Post, one of the hobby's first publications. The set is designated as W602 in the American Card Catalog. It contains 108 cards that can be readily classified into three distinct subsets, each containing 36 cards.
 Series 1 (Green Border)
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 Series 2 (Red Border)
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 Series 3 (Gold Border)
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Each 36-card series is identified by the color of the thin rule that defines the outer edge of each card. Thus, depending on the color of the card's perimeter, each subset is referenced as the Green Border Series, Red Border Series, or Gold Border Series, respectively.
The white-bordered cards displayed black-and-white player images. Only the player's name is printed under the image. The cards are unnumbered and have blank backs.
When cut from the sheets on the thin lines that define each of the cards, the cards in all three series measure
2-1/2 inches wide. However, although the cards in the first two series are 3 inches high, those in the third series measure a full 1/8 inch higher, or 3-1/8 inches.
Each of the three 36-card subsets were printed on six sheets with each sheet containing six cards (see example at right).
The uncut sheets measure 7 by 10 inches. Each is titled "Baseball Miniatures" along with the sheet number.
Sheet numbers are sequenced separately for each of the three subsets. Thus, they are numbered as Sheet Number One through Six for each of the color coded subsets (green, red and gold).
Each of the three series could be obtained by mailing in a "Special Miniature Order From" that was inserted into the monthly Trading Post magazine.
 W602 Order Form--Green Series
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 Order Form Back--Green Series (Blackwell)
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The front and back of an example order form are shown at left.
Subscribers were instructed to cut on the form border to "fit yellow envelope" which was also inserted into the magazine (example shown here).
As indicated on the back of the order from, the 36-card sets were sold separately at $1 per series.
Note that, without exception, all 108 players featured in the W602 Miniatures set are also found in the W603 All-Star Picture File set, which contains 125 players. In fact, all but one of the W602 Miniatures cards displays the exact same player photo in a smaller format. The exception is the card for Ted Williams, which uses a different pose, although the similar background indicates that they were likely taken in the same photo shoot.
A small number of W602/W603 player poses are also found in other sets. Examples include those shown below for Cardinals HOF right fielder Enos Slaughter (cards from all four sets are displayed at approximate relative size).
Note: A Set Profile, which includes a full Player Checklist and complete Gallery for each of the three subsets, is provided on the Old Cardboard website.