Originally Posted by Ron Bennett

marihuana is a correct spelling (marijuana may be spelled either way; any decent dictionary will list both) - many U.S. govt reports, documents, etc spell it that way, such as the well known report, in drug policy reform circles, titled "marihuana: a signal of misunderstanding" published in 1972 by the National Commission on Marihuana and Drug Abuse - note the spelling.

If anything, the marihuana spelling adds value, since that's how it was commonly spelled then - note the stamps were printed in 1917 and then overstriked in 1937 ... that's why the date field in the receipt next to each stamp begins with "191"; the book cover adds value, since it puts the stamps into context; mentions both years.

Ron