Vintage Alvis 12/50 window winder repair

My chain drive wind up window slipped its chain and needed to fix this - simple enough but this is surely a lost form of winding up windows! 1927 Alvis 12/50

[@Birashanuman]

If you were to install a Shimano rear derailleur cassette ,you could have a choice of speeds at which to raise & lower the glass : My chum's Firefly has no windows ..so no such dilemma ...