Switzerland 
1934 NABA Block/Miniature Sheet FU, with Certificate

1934 National Philatelic Exhibition , Zurich

Certificate 26/12/1972, “This block is genuine and flawless and genuinely used” (Google Translation from German)

Scott 226, Value US$550 (2008)

Stanley Gibbons MS357, Value £500 (2008)

Condition: Fine Used