CH 1947 FDC steam locomotive with addr., 277.2.01 missing Spoke

CH 1947 FDC Steam locomotive "Spanish Brötli-Bahn" on white envelope with address, cancelled with first day special cancellation "100 Years Swiss Railways 9.VIII.47 Jubiläumsfahrt Zürich-Baden",

variant: missing spoke in drive train of the locomotive, top left stamp of the block of four, best quality, (SBK 277.2.01, Michel 484)