Charles Eckhart Company

The Charles G. Eckhart Company was a metal work company with manufacturing services for Masters, Mothers and Stampers.
In operation circa 1940 thru circa 1955. The company also had a label "Studiodisc" that is known to have made audio letters for servicemen during WWII.
Their metal work can be identified by <E> [E Fully Enclosed in <> stamped. Use the "Mastered At" when crediting this company