A very cold day in Scotland encourages you to sit in a warm spot and idle away a few hours solving a mystery. It seems Commander Franco was an interesting person to dig deeper about. Brother of General Franco, long range aviation pioneer, politician of flexible allegiances, hero in Spanish speaking parts of the world, rescued mid ocean by the Royal Navy, postage stamp issued commemorating his Spain-Argentina flight in 1926 ( reason for trophy?) and the Donier Wal he flew still exists in an Argentinian air museum plus a replica in Spain.
A google search on his name, add Spain as an extra filter, throws up a lot and a search on Ebay (!) a bit more. Thank you John for saving my day.