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Stamp picture
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First day of issue: March 22, 1976
Occasion: 1976 Winter Olympics,1976,Innsbruck,Austria
Width: 39 mm
Height: 22 mm
Perforation: Perforated 11.50 x 11.50
Creative team:
     Josef Liesler, Designer
     Jan Mráček, Engraver
Catalog number:
     Pofis 2189 DV8/2
Location: Ice Hockey Volume XLI
Stamp ID = 6725

This is cze-19760322-s-001 with a defect that the Pofis catalog describes as "ryska pod „SB”" (line under "SB") as shown below

Close up picture of error

Miller, Rick. "Stamps show where the dead countries are buried." Linn's Stamp News 23 Dec. 2019: 16-17. Print.

Czechoslovakia (1918-93)
Czechoslovakia's first stamps were issued in 1918, and its last regular postage stamp was issued Dec. 18, 1992. In total Czechoslovakia issued almost 2,900 postage stamps, about 170 semipostal stamps, 93 airmal stamps, three special delivery stamps, three personal delivery stamps, more than 100 postage due stamps, 15 Official stamps, two local Official stamps and about 35 newspaper stamps.