Cups
1. Old: Turquoise made from 1937 -1969 (this one was my mothers from the 50's)
2. New: White made from 1986- present (bought at a garage sale)
3. Old: Colbalt Blue made from 1936 -1951 (this one was my mothers from the 50's)
4. New: Periwinkle Blue made from 1989- 2006 (bought at a garage sale)
5. Old: Old Ivory made from 1936-1951(this one was my mothers from the 50's)
Stamps
A. OLD FIESTA MARKING “HLC on bottom, Genuine on top" Ink stamp under glazing
be careful- I do have new pieces with fiesta indented stamp, no Genuine on top
HCl USA
B. NEW FIESTA MARKING "HLC on top in Capital Letters" indented stamp
C. OLD FIESTA MARKING "HLC on bottom" indented stamp
if it says "Lead Free" on the back stamp it was made after 1986