I think your maker is Joseph Schachtel from Silesia area of Germany. In business from mid 1800's to 1920. located two marks - one is a raised up JS inside a shield or crest - the other, from apparently a later period, late 1800's to early 1900's is a JS with a pattern of fleur-de-lis arranged above the initials in a sort of diamond pattern. Without seeing the vase, I can't give a value, but I did find in my googling a cobalt blue vase with a scene on it and it was for sale for $100. Suggest you keep googling - and try this site:
www.porcelainmarksa ndmore.comI didn't find that factory's marks - but Chris Simon Marshall who owns the site can dig into his data bases, with of course a picture of the backstamp, and perhaps refine the date of manufacture. KB
