This voucher entitles you to a free drinkon the house.
1960 March, G. Freeman Allen, “Europe's most luxurious express - the "Settebello"”, inTrains Illustrated, page146:
It is obviously a "plum" job, one distinction being that its motormen are granted an allowance of about 6s.[six shillings] towards the cost of Wagons-Lits food in the crew quarters of the train, [...]. Additionally, by the way, each man is allowed a quarter of a bottle of wine "on the house" per trip!
