Dear Joey, YT
Thank you both for looking and your input.
There are several reasons why the design elements seen here give it a Chinese attribution.
The grape enamelling is a Chinese design element in the grapevine patterns of some ceramics. This character has not been known to me as either Japanese or Korean. Here is another Chinese example however it was done in a different manner
http://auctions.freemansauction.com/auction-lot-detail/A-large-and-rare-Chinese-underglaze-blue-and-red-squirrel-an/1523+++++185+/++934365The use of the natural slip tones of Yixing ware was preferred by the literati class, as noted in the Gotheborg glossary. The artist here used the contrasts of the natural slip tones to illustrate the vine pattern. And, below is a link to a post of the Yixing bottles on the forum, with the one pictured on the right in the link painted in a dark chocolate slip color against the natural unpainted ground, in contrasting colors just as w/this one. Highlighting another character element with the use of contrasting colors,in both a natural unpainted ground and chocolate brown painted pattern that is Chinese, rather than Korean or Japanese
http://snuffbottle.smfforfree.com/index.php/topic,352.0.htmlAlso, in the post it was noted that the glaze ends "short of the base" which I believe to mean at the rim. The uneven line at the end of the glaze is characteristic of an older piece
It's concave foot matches with the description given in the link. A concave potted foot done in this manner is unknown to me as either Japanese or Korean
On vase or bottle- the neck is too short to be a bottle vase. A long sloping neck design would be characteristic of a bottle vase. The convex lip rim is also characteristic of ceramic bottles. Of the many ceramic bottle vases that I have seen, the lips are smooth.
The mouth is of expected bottle diameter as opposed to the wider or fluted mouth of a vase
This one was meant to be handled w/a very tactile feel, rather than rest on a shelf
Best,
Kevin