'Miyako Yama Ka' kanji roller that's classified as maker's mark WP #155.
This raised cartouche has the rounded version of the outline and inside has a column of four symbols in vertical alignment.
The first three katakana symbols (from top to bottom) translate to 'Miyako'.
The fourth symbol is comprised of a double crested mountain with a upside-down '4' underneath. The upside-down '4' could be the kanji symbol 'Chikara' or the symbol for 'Ka'.
This float is the elongated type that measures 7 1/4 inches in length and 2 inches wide.
Truly a prized float for any collector.