Steve Sly Japanese Works of Art has dated this piece to the 1890s.

For a very similar okimono monkey group see.
"The Golden Age Of Japanese Okimono" by Laura Bordignon
Outer spine photo plus pages 90-91 where it is also suggested Masatami moved from Nagoya to Osaka in the late 19th century and excelled in the carving of monkeys and rats.

Approximate sizes
Height 3.25" 8 cm
Width 2.25" 6 cm
Depth 1.75" 4.5 cm
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Steve Sly Japanese Works of Art has dated this piece to the 1890s.
Specialists in japanese works of art from the meiji period 1868-1912
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