I'm not sure if this is the right forum, but I haven't seen an exonumia category on the site (if there is one). I just picked up a medal that isn't described in the H&K catalog. It is identical to HK892, except that it's dated 1918 instead of 1917. Here's a link to the known/acknowledged pattern (called a type I, to differentiate it from a very different good luck wartime medal): http://www.so-calleddollars.com/Events/World_War_I_Good_Luck_Medals.html HK892 is described as an R-4 rarity, but far fewer than that are known in any numismatic holdings (30-40 have been tracked vs 500-1,500 estimated in existence). There's quite a discrepancy in those numbers: a few are probably held in militaria collections, but my impression is that R-4 may understate the surviving number. There may be more of these "good luck" pieces buried with their recipients in France than held in any type of collection. I can't think of anything that would preclude the 1918 version from qualifying for the SCD series, and I don't know if it's been identified before. There's also a note on an attempted census that indicates that I'm not the first to spot this date variety: http://www.socalleddollar.com/notes.html#HK892 "HK892: Found dated either 1917 or 1918. The 1st edition of HK describes this piece as being dated 1917, but shows a picture of the 1918 piece. The 2nd edition shows the 1917 piece. My tally numbers probably(?) include only 1917 pieces. 1918 pieces appear to be more rare."
These may not be as uncommon as my research suggested. I found 2 more examples at the TNA show in Arlington this weekend (one in VF & one in EF with traces of mint luster):
