Did the Finns grind off the Imperial Russian Eagles off M91 receivers?
Yes. This was a common practice not only by the Finns but also by the Soviets and other nations. When the Tsar fell there were not many in Europe that cried over his loss of power. He had made a number of enemies and many were glad to see him go. They were not all that happy to see the Communists in power but few missed the Tsar.