Postal Stationery items. 1896, essay of letter card with pre-paid reply 10k+10k blue, each part with red overprint ''PROEKT'', insignificant perf separation at right, still fresh, VF and very rare, Standard Cat. #ES6 A, Est. $1,000-$1,200 (Image)

Postal Stationery items. 1899, letter-sheet of 7k blue, series 1, printed in St. Petersburg, containing over 30 various advertisements inside and on reverse, folded several times, some flap wearing, still VF, Est. $400-$500 (Image)