Thank you Charll and all
we are looking at many similarities between this bottle and what we know of design elements and construction of Chinese bottles and Qing period ceramic patterns:
The Yixing bottle example posted earlier here on the forum with the chocolate brown slip painted on a natural ground surface
By Gotheborg description, the natural slip hues were preferred of the painted Yixing bottles.....again and to the above this is what my bottle shows.
The thickly applied enamel used to form the grapes is a known Chinese technique (link to a porcelain example given above).... this is how the grapes on my bottle were formed- but w/the enamel applied underglaze not on top
Early Yixing ware is known for simple applied floral and grapevine patterns and many w/ squirrels about the lids or handles in monochrome or monochromatic tones. The absence of a squirrel here may only be an artistic choice, and painting is difficult to accomplish on the natural stone surface
some examples: The 1st is a light chocolate applique grapevine pattern over a buff ground- no squirrels - described as early Qing by the auctioneer
https://www.bonhams.com/auctions/21882/lot/323/ https://www.bonhams.com/auctions/21882/lot/320/https://www.bonhams.com/auctions/22656/lot/77/ https://www.bonhams.com/auctions/19927/lot/212/Best,
Kevin