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Atradu šo ierakstīto aviopasta aploksni ar man nezināmu pasta zīmogu - Rīga APS-1 . Vai kāds var man pateikt, kas bija šī pasta nodaļa un kur tā atradās? Above text translated to Latvian via Google Translate: Found this registered airmail envelope with an to me unknown postmark - Rīga APS-1. Can any...

Hello Martin, Sorry for the somewhat late response. There are very few written sources for overprinted Soviet postal stationery issued by Latvijas Pasts. Two catalogues comes to mind: 1. Michel Ganzsachen Europa ab 1960; Westliches Europa 2011 (ISBN: 978-3-87858-056-0). 2. Specialized Catalogue of P...