1924 Dr Eckerlin’s Rotary Press sample sheetlet printed in black on ungummed, watermarked paper showing two KEVII 1d (larger than the issued stamp) as well as a Russian 1913 7k Romanov, produced in the hope of selling this rotary press process (developed by Herbst & Illig) to the British and Russian Post, unusual, incl. photocopy of cert. RPS for a similar item for reference