Thanks for the input. For example this current add on ebay, the fellow says that there are no date codes etched on glass or frame and they have 07347 made in Germany printed on the back. He feels that they are early sixties. Any opinion as to genuine early 60's
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&ih=003&sspagename=STRK%3AMEWA%3APIC&viewitem=&item=13009844