Finnish road sign of 1939. The sign indicates that the road on which it is installed has the right of way. The edge of the sign is red while the background is yellow but the precise colors are not known because the sign was drawn from a black and white photo.
B. B., "Le comunicazioni stradali della Finlandia" (pages 122-125 of the magazine "Le strade", year 1940, published by the Touring Club Italiano)
Civitas13 (the sign was originally drawn by the Finnish government)