Impasto ware is often confused with faience simply because the body it uses is often the same. Later pieces seem to actually use a faience body as you can clearly see with this marking.
The similarity to faience differs with the decoration of Impasto ware. The coloured slips with the latter were applied so thickly that the images, mainly of flowers, appear almost in relief.
Impasto was produced between 1888 and ca.1914. The great Kate Rogers seems to have been particularly associated with this ware and the large vase above is by her and dated 1888.