Sillerenbühl is a mountain about 1.970 m above sea level in the municipality in of western Bernese Alps near the city of Albristhorn in Switzerland. In summer the region is famous for hiking and in wither of course for skiing.
Stamps (from the left):
Pro Patria - Art (from a set of four) - Issued: 29-05-1970
International Year of Crystallography (from a set of two) - Issued: 06-03-2014 (with hand cancellation "3713 Reichenbach Im Kandertal")
Thanks to Hansjürg for this nice card and stamps!