Sigismund Wróblewski and Karol Olszewski Commemorative
Poland · 2015 · 4,20 zł
The stamp features portraits of Polish scientists Sigismund Wróblewski and Karol Olszewski, with scientific apparatus in the background, commemorating their contributions to physics and chemistry.
This stamp commemorates Sigismund Wróblewski and Karol Olszewski, Polish chemists and physicists renowned for their pioneering work in the liquefaction of gases, particularly oxygen and nitrogen, in the late 19th century.
Printing Method
Offset
Image: <a href="//commons.wikimedia.org/w/index.php?title=User:Alowell&action=edit&redlink=1" class="new" title="User:Alowell (page does not exist)">Alowell</a> · License: CC BY-SA 3.0
Estimated Values by Condition
Perfectly centered, fresh, no faults
Well centered, fresh colors
Nicely centered, minor flaws
Average centering, acceptable
Off-center or visible wear
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