Here are three worldwide insulators with a green stripe - these were used as markers -- actual postage additional:

U-1735 from Germany -- just one tiny scratch -- $15 (SOLD)

U-1714 (sim) -- this is a bit smaller version! From Italy - no markings - no issues -- $15

U-1774 from Italy -- inkstamped with crown VERBANO in a triangle logo on the crown -- one tiny peck -- $15 (SOLD)