CH 1943 B20-B21 Pro Patria FDC with address (2 registered letters)

Switzerland 1943 B (Swiss National Fête and PRO PATRIA - issues)
Landschafts- und Stadtbild,
FDC, 2 PTT covers with address (sog. Gaudard letter) with gray vignette "Ersttag-Stempel",
1. registered letter with bloc of four, corresponding stamp to the first day cancellation "15.VI.43 INTRAGNA",
2. registered letter with pair, corresponding stamp to the first day cancellation  "15.VI.43 BERN 3 Bundeshaus", luxury quality,
Catalog SBK B20-B21, Michel 420-421.