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That's too bad about the Serbs - I bought several packs and they are indeed excellent figures with lots of conversion possibilities. Perhaps a better seller might have been a set of Serbs in summer uniforms for the Balkan Wars and the campaigns of 1914-15 - those are much better known by the general public (at least the part of the general public that wargames or models with 20 mm soldiers) than the later campaigns in Macedonia. You could also have given them Austro-Hungarian or Bulgarian opponents in distinctive uniforms - no one has ever made WW1 Bulgarians in plastic or any of the early-war Austro-Hungarian cavalry units (hussars, dragoons or uhlans).