Image Colnect-140-558-International-Prototype-Metre---Krypton-spectral-line.jpg

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Type: stamp Issuer: Switzerland Date: 1975 Denom: ? Visibility: public Image owner: none postage 2/13/1975 15(c) multi issue=International Meter Convention 100th unwmk perf=11.5 Crops No visible images cropped from this one. Measurements Resolution is unknown. Source Source name: Colnect File URL: http://i.colnect.net/b/140/558/International-Prototype-Metre---Krypton-spectral-line.jpg Uploaded August 16, 2014, 2:50 pm by Stan Shebs