I found this:
"The Mallett" $$$$PRICE DROP$$$$
Layton, UT 84040 | Nov 12, 2009
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***NEED TO SELL, make me an offer**** For the golfer that has it all. Koa Clubs designed by Jewell. I have a custom made putter. The putter is from the KO'OLAU Golf Club in Hawaii. The shaft and head are made out of Koa wood, which is from the Acacia Tree. The wrap is a Lamkin out of England. This is a custom one of a kind putter. These putters sell for between $850.00 and $1800.00 depending on condition. This putter is still in the original package, with the tags attached. I marked it at 500.00, but will observe all serious inquiries.
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Here is an article from Bend Oregon in May 2009 about a man named Dryer making Koa Putters:
Bend man creates something for golfer with everything wooden putters
By Zack Hall / The Bulletin
Published: May 27. 2009 4:00AM PST
Here is a Dryer Koa putter for sale in a company in Maryland:
Here is a person writing in March 2008 who bought one made by Dave Musty of Musty Putters:
Koa Wood Putter
Just a recent purchase from the golf show on 2/18 here in Boston. I've been attending the golf show for 3 years now and every year I stop by the "Musty Putters" booth and putt. This year I happened to ask David Musty if he could make a putter for me out of Koa Wood. I didn't expect him to say yes, but he did and he also had one on hand for me to try out. I placed my order for one and it arrived a couple of days ago. Here it is, a sure thing of beauty!
Here is the link to the Musty Koa Putter:
That's all I can find right now.