Wow, Zach. Very nice.
Manfred's is a good reference. Here's another.
My picture shows one sold at auction for $300 US dollars. The description of the one in my picture follows:
iNumis> Mail Bid Sale 17 Auction date: 23 March 2012
Lot number: 1811
Price realized: 230 EUR (Approx. 305 USD / 192 GBP / 277 CHF)
Panama, medal for the opening of the canal and the San Francisco Exposition, 1915
A / PANAMA PACIFIC INTERNATIONAL EXHIBITION SAN FRANCISCO CALIFORNIA FEB TO DEC 1915
An angel holding a torch and placed on a scroll inscribed Liberty / Equality / Fraternity, lifts the veil on the Isthmus of Panama. On the other side, the San Francisco Expo pavilion
R / FRENCH REPUBLIC
The San Francisco Exposition Tower; below SAN FRANCISCO CAL./ AD / MDCCCCXV
Bronze 51.0 mm 85.33 g 12 hrs
TTB +, RR
The first attempt to build a canal in Panama began in 1880 under French leadership. The work was completed by the United States of America in 1914. This plaque recalls this work that claimed the lives of over 25,000 workers as well as the Panama-Pacific International Exposition of San Francisco. This medal is undoubtedly French, but is neither signed nor stamped. A few strokes on the listellos but a rare copy with a nice patina
Estimate: 350 EUR
Starting price: 200 EUR