Tin for Ucal Bronchial Lozenges for 'coughs, colds, chest troubles and Throat afflictions' the kind of thing which would be used by people working outside and sent as a gift by caring loved ones to those in the forces. This is a lovely little bix and I would guess dates from the 20's or earlier. Tin is empty, sold as collectable only and should not be used.
Photo shows actual item