Wow! Great find!! I am a mod orange junky so here we go..

Mod orange appeared in June of 1967. The color was released at the same time as psych red was. Officially the two colors appeared in a print ad for the first time in the spring 1968 edition of the Ludwig drummer. It never actually made a catalog appearance until the 1971 catalog, which was printed in 1970. BTW Citrus mod also appeared in the 1971(70) catalog but was released in mid 1969. As far as I can tell mod orange lasted until about 1972 sometime. I was born Dec 18 1970 so that kit is pretty close to me!

John Densmore has a late 1967 down beat 20,12,14 set that he used all through the Doors tenure. He got it around the time the Doors appeared on Ed Sullivan to promote light my fire. You have a very cool set and it looks great! good luck with it.