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Fast Facts
Year(s) Issued: 1921
Set Designation: W521
Number Cards: 20
Card Size: 1-1/2" x 2-1/2"
Common Card Value (Good Condition): $25
Scarcity Rating: (1 to 10, 10 scarcest): 9
W521 Strip Card Set
Keys For Collectors
W519 vs W521 - How To Tell The Difference?
The W521 set is a complete replica of the W519 set, with one significant difference.
The images on the W521 cards are flipped in comparison to the W519 set.
Here's a comparison of the W519 and W521 Ruth. Notice how the W521 image is printed with the image of Ruth flipped horizontally?

W519-1-1 Ruth

W521 Ruth
Here's a look at the George Sisler from the W519 and W521 sets and we can observe the same mirror image phenomenon versus the W519 card.

W519-1-1 George Sisler

W521 George Sisler
Thus, if you can't tell the difference, the easy tell is to compare the card versus a known W519 issue, or look for hints on the uniform--for example the backwards 'St Louis' on Sisler's jersey.
Even the grading companies have confused these cards in the past. Here's a Sisler card that PSA graded as a W521, but which is clearly a W519-1-1 issue.

W521 Cards for Sale on eBay
1921 W521 #5 Babe Ruth SGC A Authentic Hand Cut
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1921 W521 #13 Jesse Barnes Strip Card
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1921 W521 #18 Frank Frisch HOF TOUGH
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1921 W521 #9 WILBERT (wilbur) Robinson HOF TOUGH
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1921 W521 #17 Joe Murphy SGC Authentic RARE - Low pop!
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RARE 1921 W521 RAY SCHALK Reverse Image #15 Strip Card, Chicago HOF
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1921 W521 #9 Wilbur Robinson
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1921 W521 #18 Frank Frisch
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1921 W521 Strip Card #16 Kid Gleason Chicago Black Sox TOUGH Issue!
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