Stamp 3 + 4 = Central Lithuania, Michel No 1 A + B, vermilion, 25 Fennigi (value: 0,60 / 0,70 DM in the 1995/96 catalogue) - so, mass ware, no great values
Central Lithuania (German: Mittellitauen) = Polish occupation of the "Vilius area" 1920-1922 (country name: "#346;rodkowa Litwa" or "Litwa #346;rodkowa") - see
https://commons.wikimedia.org/wiki/...al_Lithuania