80 hrv, greenish blue and brown: Zaporozhian Kozaks in "chaiky" (swift maneuverable boats) on the Black Sea. The standing figure carries a Kozak flag, while the others row. Some large chaiky could hold 50 to 70 men and carry up to four small cannons. By means of these craft, Kozaks were able to make numerous daring forays against Turkish sailing vessels, as well as against Turkish towns along the Black Sea coast. These expeditions not only netted great booty, but also freed thousands of Christian slaves.
Ukraine 1920 80hrv sg?, scott? (image can be found on http://www.shipstamps.co.uk/forum/viewt ... 12&t=14604 )
More on this set of stamps is given: http://www.ukrweekly.com/old/archive/1999/109920.shtml