We found one dictionary that defines the word four bar cancel:

Art (1 matching dictionary)

1. Glossary of Stamp Collecting Terms (No longer online)

▸ Words similar to four bar cancel ▸ Usage examples for four bar cancel ▸ Idioms related to four bar cancel ▸ Wikipedia articles (New!) ▸ Words that often appear near four bar cancel ▸ Rhymes of four bar cancel ▸ Invented words related to four bar cancel