Bidspirit auction | A trio of mid-20th-century vintage

A trio of mid-20th-century vintage prism binoculars. The collection includes a pair marked Charles Frank 10 X 50 Field 5 degrees and FRANK-NIPOLE COATED OPTICS No 10529. A second pair is branded Prinz 10x50 and marked coated optics field 5.3 degrees. The third pair is marked 12 X 50 Field 5 degrees No 69887 and COATED LENSES.