Identifying an old Japanese Vase

Hi.
I inherited a vase from my granddad which seems very old but I cannot find out what it's about.

Here is the story.
My great granddad was captain of a mercantile fleet around 1900 (we live in northern Germany close to the sea) and he has travelled to Asia a lot. He brought home this vase. He also brought another vase and this one was a kind of valuable. But that one on the foto seems older and maybe more like clay and less like porcelaine.
It's 46cm high, that's about 18 inches.

Fotos:
http://imageshack.com/a/img921/2022/rpQPgJ.jpg
http://imageshack.com/a/img923/4914/pf7iIX.jpg
http://imageshack.com/a/img922/1606/JhM44g.jpg
http://imageshack.com/a/img924/1663/TgkCED.jpg

I am thankful for every hint.

Looks like an Imari ware vase, similar to these: http://www.skinnerinc.com/auctions/2363/lots/240

Certainly worth bringing to an expert for an estimation, I would say.

hi..
i concur.
Skinner auctions is Boston [Mass] finest auction houses. the sale price of a pair over a thousand might be expected in Boston.
perhaps not elsewhere. this would make a single about $ 500.
height comparison is consistent at 18 ''. also history and age jibes.

need a native reader to confirm kanki..if it can be read.
style is older.

surprising it has made it this long. try not to drop it..haha

I'm sorry, my English is not good...
Decorative pots burned in Saga and Nagasaki Prefecture from the latter half of the 17th century to the latter half of the 18th century were exported from the port of Imari to European countries.
Therefore, there porcelain was called from the name of the harbor in the name of Imari inside and outside the country. The decorative jar which went to Europe was decorated in the royal palace and the aristocratic mansion and had a lot of influence on foreign ceramics making (Now it is call " Old Imari " .)
The elegant and brilliant style that fascinated Europe in the 17th century continues to be loved, and there is still making it.