Brabazon Think you're on the right track there.The aircraft you linked to C-FLFR has a manufacturers serial No of 13155.However Buffalo run a DC3 with MnSer 9371 reg C-GWIR.
Trying to get a date for it's manufacture but seem to be going round in circles!Think honours must go eventually to a DC3.
IMHO Think qualification must be in service with a registered airline and not a museum piece that doesn't earn a living.