Sweden. Accumulation used coil stamps in visir album. E.g.142Acx, 143Acx, 143Ecx, 144Abz, cx, cxz, 144Cbz, 149Abz, 149C, 151Abz, 151C, Cbz, 152Abz, cx, 152Cbz, often heavily duplicated. F for mentioned ones is 32600. Please inspect.