Threpenny or Threepenny: How To spell?
The word Threpenny is misspelled against Threepenny, an adjective meaning "Costing or worth three pence; hence, worth but little; poor; mean."
Threepenny has double "ee" is mispronounced as "e"Remember double 'EE' in between the strings Thr & penny which should not be misspelled with single 'E'
Wrong Spelling:  Thr-e-penny  Correct Spelling:  Thr-ee-penny 
Explore spell check of Threepenny to spell without errors.