CH 2011 FDC Bloc 50 years of the Swiss national anthem Single Stamps

CH 2011 FDC 50 years of the Swiss national anthem in  German, French, Italian and Romansh Single Stamps out of bloc (SBK 1390-93, Michel 2199-2202) on off. ill. FDC Format C6 without address and off. first day cancellations 5.5.2011, no sale in this form by postal administration!