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Type: stamp Issuer: Austria Date: 1981 Denom: ? Visibility: public Image owner: none postage 8/31/1981 6s dkbrnred issue=Congress for Clinical Chemistry d=Johann Florian Heller unwmk perf=14.25x13.75 Crops No visible images cropped from this one. Measurements Resolution is unknown. Source Source name: Colnect File URL: http://i.colnect.net/images/b/137/113/Johann-Florian-Heller-1813-1871-pioneer-chemical-diagnosti.jpg Uploaded August 28, 2014, 9:40 pm by Stan Shebs