Lawrence Welk's 1957 show featuring new instrument

First aired June 8, 1957.
Lawrence Welk performs "Three O' Clock In The Morning" on a brand new 1957 Thomas Chord Organ [Lawrence calls it 'Accordione'].
The thumbnail picture is all I could find on Google about this instrument. Perhaps not as popular and the cost is quite hefty [about $7500 in 2024 dollars].