I just read the nice review by Eric Schena on the recently published book by Jeff Shevlin and William Hyder on So-Called Dollars From the Pacific Coast Expositions.

I contributed some items for the book including the die used to make the original So-Called dollar for the Exposition and the medal for the book as shown in the attached photos. The medal encased in the front cover is brass, but I used the bronze one as it photographs better.