20l deep blue (pos.91/3rd setting), used. Grooms characterisitc "2" No.5 and "0" No.16. In Koundouros study mentioned pos.90 under Grooms "0" No.16 for this setting. In addition "0" No.16 has been found on 10 lepta meshed paper in pair pos.91-92 canc. "ΠΑΤΡΑΙ*9.ΙΑΝ.73". A superb copy and a strong tool for the correct determination of the control number settings. (Hellas 35e).