Wilson, Gene Sarazen, R-20 Classic Original Sand Wedge

Purchased from a classic club shop over 30 years ago. I believe it is an R-20, manufactured in 1935. Wilson made a sand wedge named after Gene Sarazen, the inventor of the sand wedge. I think it can be called the originator of the sand wedge with bounce. Thank you to those who understand classic clubs. The book is not for sale.