re: Guatemala Quetzal stamp, all red,, 5 cts.
I think it's Scott #372, issued in 1958. The color listed is orange vermilion. The CV is $1.75 mint and $.25 used. In 1957, a 5 centavo version was issued in brown. I don't know the backstory as to why there was this color change made a year later..
Jim
 
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