|San Francisco Mechanics Institute
|Alan V. Weinberg comments: Apparently these dies were only used in 1868. I've seen perhaps 3 or 4 of this medal in silver in over 50 yrs- it is ex rare in this design. It does not exist in bronze and I own the only gold I've ever heard of - also presented in 1868.
|Alan V. Weinberg Collection (Agricultural and Mechanical Society Medals)