Tower Challenger Typewriters by Year then Serial Number
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1954 Tower Challenger Typewriters by Serial Number
1956 Tower Challenger Typewriters by Serial Number
Tower Typewriter Models
Tower Attaché • Tower Capri • Tower Challenger • Tower Chieftain • Tower Chieftain II • Tower Chieftain III • Tower Citation • Tower Citation 88 • Tower Collegian • Tower Commander • Tower Constellation • Tower Electric • Tower Portable • Tower Portable K • Tower President • Tower President XII • Tower Quiet Tabulator • Tower Quiet-Tabulator • Tower Standard • Tower Tabulator • Tower Voyager