A very tatty copy, being thinned, faded and dirty but I am unwilling to attempt any cleaning up until I know what I have. It fits with the description of O2 but with four clear margins. However, the paper is somewhat thicker than I would associate with a postage stamp and of poorer quality being softer and possibly having fibre inclusions (granite paper?). My first inclination is to think it is simply a cut square from an envelope but here is my question. Were there any preprinted official envelopes issued for these stamps?