This Austrian travelling inkwell was made for the navy as identified by the double headed eagle and anchor on the inner cap. It’s crude but ingenious: the same catch which releases the outer cap also releases the inner one.
It dates to around 1900, so in the latter years of the Austrian Empire. These items are not unknown. Auction houses in Britain value them at £5-£25 depending on condition. In the USA they fetch higher prices.
This well-used and battered example is at the lower end of these values. It was once as vital and valuable a means of communication for the Austrian seaman as today’s cellphone.