North Ingria stamps were in use from 21 Mar – 5 Dec, 1920. It is speculated that there are 3 different sets of forgeries although the one featured in the article accounts for almost all the plentiful forgeries. Counterfeit issues were apparently forged in Britain. There is some speculation that Nino Imperato may have also been involved. More forgeries appear to have surfaced in Europe in the 1980s and 1990s and are commonly available today.
Last Edit: Feb 15, 2020 14:25:52 GMT by tomiseksj: removed dead link