Municipal Postal Services 1914–1918 – PRZEDBÓRZ,
stamp series Fi 3a–6a—denominations 2 gr **/ 4 gr ** / 6 gr ** / 10 gr **,
stamps are imperforated, uncancelled, without adhesive residue,
MIKSTEIN guarantee [stamp on the reverse]
Reference: Fischer, “Catalog of Polish Postage Stamps (and Those Related to Poland),” Vol. II, p. 65 [2022 ed.]
