I do not see this particular die listed in either the Laudeman or the Olsen&Johnson books. It is definetly from the 50s-60s because it is nitrate. A pair would might range from $20 to $100 depending on Condition, Rarity of the issue and Who Wants It . A single die might go for 25% to 75% of a pair depending on the same factors. The fact that it is starting to crystalize and is chiped will reduce its value as well as the fact that the logo paint is worn. By blowing up the image I can see that the logo is still there and would fill with crayon for display in a collection.