Greg Burns currently serves as editor of The California Numismatist, the award-winning joint publication of the California State Numismatic Association (CSNA) and the Numismatic Association of Southern California (NASC), and has been a coin collector for about 35 years. His collecting passions are the satirical medals of the German medallist, Karl Goetz, medals relating to WWI in general, and he has a longtime fascination with Canadian colonials and bank tokens.
There are many varieties of the Lusitania medals in the market place. I've written a book that describes each of these in detail along with easy to apply identifiers and approximate rarity and prices, but here are the basics:
Goetz First Medal (dated 5 MAI 1915)
Goetz Second Medal (dated 7 MAI 1915)