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Stamp picture
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First day of issue: April 26, 1978
Occasion: 1978 Men's World Ice Hockey Championships,1978,,Czechoslovakia
Width: 48 mm
Height: 29 mm
Perforation: Perforated 11.25 x 11.50
Location: Ice Hockey Volume XLI
Stamp ID = 4979

According to the Pofis stamp catalog (a Czech stamp catalog) there is one variety for this stamp. This is a "DV23-1" plate flaw, there is a big brown spot below the right skate of the player in front. The flawed stamp is the bottom one of the two shown.

a target="_blank" href="/stamps/scans/Czechoslovakia/_Graphics/DV23-1.jpg">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.