[2] At some later stage the business expanded into a second premises located in the Glasgow city centre on Queen Street.
The basement of this location also held an expansive collection of antique microscopes, which was viewable by request to Arthur Frank, a son of Charles and now in charge of the business.
Unfortunately Charles Frank Ltd lost market share and in the poor economic climate of the 1970s Britain finally ceased trading in 1974.
After the original Charles Frank Ltd ceased trading and the business was sold off, the rights to the name were acquired by former staff.
For some time the new company traded from 101 Rose Street Edinburgh as a retail and wholesale seller of binoculars and telescopes but the premises are now an outlet of Viking Optical.