Because there is not a large community of collectors that collect coffee Mugs, in general regardless of who made the cup, or how it was issued it would only be worth about $10. -$20. The mug would appeal to Cincinnati Reds fans reducing the number of collectors in the market, demand, and value.
For what ii've seen on eBay, anywhere between 15 and 20 dollars
There is not a definitive value for antique red glass. There are not only differing prices for when the glass was created, but what shade of red they are, such as ruby or cranberry.
Gold mixed into the silica make cranberry (red) glass.
The Invaders - 1967 Condition Red 2-1 was released on: USA: 5 September 1967
The Beautiful Blue and Red Danube - 1967 TV was released on: USA: 14 May 1967
The Red Telephone was created in 1967.
Beach Red was created in 1967.
Red Guardian was created in 1967.
Red King - Through the Looking-Glass - was created in 1871.
obviously not because the color of glass does not always effect the light
Red glass is made by dissolving gold in aqua regia, recovering the gold oxide thereby created, and adding the gold oxide to molten glass. Because of the gold content red glass is very expensive.
The Red Sox player of the year in 1967 was the Hall of Fame great Carl Yastrzemski.
All wavelengths of other colors of visible light are absorbed, only the wavelengths of red light will pass thru the glass.