My grandfather's travelling six-colour inkwell set. He obviously used the Yellow and Green a lot as the bottle tops are a bit chipped but otherwise they are in great working order! I've never seen another such set - plenty of individual bottles - but these are obviously made as a set as they are manufacturer-inscribed with the colours.
I guess these are WW1 era as he was born in 1888 and travelled with WHite Star as accountant (shipping clerk?) on the Olympic (sister ship to the Titanic).
It would be great if anyone has any further information on when and how many of these were made.