Australian 100 dollar koala [решено]

I have a coin that I can't find in the Numista catalogue, and I was hoping somebody here could help me find information about it. What I know is basically what can be seen by looking at it. It's 31 millimeters in diameter. it's 99.95% platinum, issued in 1991 with a picture of Queen Elizabeth II on the obverse and a koala climbing on a branch on the reverse. It has the initials JB on the reverse, which I assume are the initials of the person who designed the coin.

This is from the 2016 Krause 1901-2000, 43rd Edition

Thank you. That's the one. It doesn't seem to be in the catalogue here, so I'll submit it after I take a good picture of it.