Tiki Farm Mugs

When did Tiki Farms start putting dates on the bottom of their mugs? Do they always put dates on all of the mugs now?

We started dating fairly early on, I believe back in around late 2001/early 2002. Any undated mugs are likely prior to that. Any shots undated can be those produced as recently as this year (given the limited field on the bottom area). Hope this helps!