CH 1945 FDC bloc "Spende" ill. no address

CH 1945 FDC bloc "Spende", illustrated envelope without address, best quality (SBK W21, Michel Bl.11),
with First Day Cancellation "20.III.45 BERN SCHWEIZ. POSTMUSEUM" and additional red cancellation "2000. Tag des 2. Weltkriegs", rare in this version.