1h-1000h Castles with "SO 1920" Overprint
1h-200h Castles with "SO 1920" Overprints
Poland 5f-5k with "SO 1920" Overprints
2h,5h Special Deliveries with "SO 1920" Overprints
5h-1000h Dues with "SO 1920" Overprints
5h,15h-1000h Dues with "SO 1920" Overprints
2h-30h Newspaper Stamps with "SO 1920" Overprint