I have a single photocopied sheet from a Russian book dated 1941. This sheet shows the title page of the book and pages 28 and 29. On page 29, figure 45, there is shown a standard M1891 5-round charger on the right and what appears to be a flat, Mauser style, charger for the same cartridges.
Was this flat charger ever made and issued for the 7.62 x 54Rmm cartridge? If so, what was its model designation and, more importantly, do any specimens exist?