The coin catalog says that's a phoenix on the front, but it certainly could be a peacock as well. Japan uses both on its coins.
100 yen pieces were minted with this pattern in silver for 1957 and 1958. Each coin contains 0.093 troy ounces of silver, so some value is picked up there. Typical catalog values run like this:
worn: $3 US dollars approximate catalog value
average circulated: $4
well preserved: $7
fully uncirculated: $12
Use our Important Terminology page to properly interpret these catalog values.