from a practical point of view, I guess it's not essential that the level can be seen from the outside - I remember our school desk ink wells were ceramic, so couldn't see into those.
The small prunts and dripping trails of green - might suggest art nouveau style - whether original i.e. somewhere around the period 1880 - 1910 ish - or from a later date and simply copying the earlier period, is open to question. Do we know the extent of wear, if any? - is there deeply ingrained dirt etc. within the prunts, for example, to indicate this might not have been made as a copy in the mid C20?
Does anyone think this might look more arts & crafts at all?
There certainly are zillions of ink wells around - and sorry to say, but I doubt you'll find a maker for this one. If pushed, my thoughts would be either eastern Europe or perhaps French - but that just idle guesswork
