CH 1943 258 - 100 years of Swiss postage stamps FDC with block of four (Registered Mail)

Switzerland 1943 100 years of Swiss postage stamps,
FDC block of four with margin of sheet,
neutral cover (C6) with address (registered letter)
cancelled with red Special cancellation "26.II.43 ZÜRICH - 100 Jahre schweizerische Postmarken",
sent to Meggen, on the reverse arrival cancellation "Meggen (Luzern) 1.III.43", in very good condition,
Catalog SBK 258, Michel 476.