What do the numbers on pink Lamb Mason Jars mean I have four jars and their numbers are 3 9 13 and 18?
The numbers found on Lamb Mason jars, and all Mason jars, are
mold numbers. The numbers 3,9,13, and 18 would be the number of the
mold the jars were made from. The jar originally started out as
clear but as it aged it would turn pink.