Dispensers changed from "footless" to "footed" in 1987, but the recent re-release of the "Regulars" are without feet. In general, if you have a 3.9 dispenser with feet, it was made after 1987. If a 3.9 dispenser is without feet, it was made before 1987. (Of course some of these were made *during* 1987, but that's difficult to determine.)
The number located on the side of the Pez dispensers indicates the
country of manufacture of each Pez dispenser, as follows (with the
country on the left side & the number on the right side of the dispenser):
1 = Hungary
5 = Slovenia or Yugoslavia
6 = China or Hong Kong
7 = Czechoslovakia
8 or 3 or 7 = Austria
The following acronyms are commonly used in Pez collecting:
MOC = Mint on card MIW = Mint in wrapper
MIB = Mint in bag NF = No feet