Frankoma (with a 'k'

changed ownership in 1991, but is still in business. Try directory information for Sapulpa, Oklahoma. Whether a particular piece is still in production is another question.
My reference book lists a 4-leaf clover ashtray (Mold No. 223) that was produced from 1957-1991, book value $7.50-$8.50. If this is the ashtray you're looking for, there ought to be quite a few of them out there, given that it was produced over so many years. Of course, finding it may still be a challenge.