I have a note in my collection that says the phone number 1-800-576-5825 is also listed as 1-800-576-LUCK.
It appears both ways on the back of a red card that was said to be from Lula, MS. Type 5 in Wells/Lamb.With French Horn Logo.
The 1-800-576-Luck version appears on the backs of a number of the Yellow with/without Jester cards.