Subject:Re: help! identifying mark please
Posted By: Martin Michels Wed, Jul 10, 2019
The mark reads: Tokkuyo 特許 2252515 二二五二五一五 (all from left to right), meaning: Patent 2252515, see my picture with the same signature.
It's a mark of Takeuchi Chubei (1852-1922).
The patent was for his Coralene or Sharkskin (Ishime Yaki), which was produced for a relatively short period in the late 19th century. The patent number 2252515 stands for the 5th month of Meiji year 22 (1889) and valid for 15 years. Takeuchi also signed most of the Sharkskin work with: Takeuchi, Takeuchi Sei, or Takeuchi Zo and with the patent number. These patent marks came into use circa 1885, after the establishment of the first Japanese Patent Office. So these markings probably date from 1889 till 1904.
It's a pity you didn't show a picture of the vase itself, because these vases are quite beautiful IMO.