| F.W. & R. King Trade card for F.W. & R. King, (successors to James Green,) Manufacturers of Mathematical, Philosophical, Optical, Surveying, and Daguerreotype Instruments, No. 33 South Street, Baltimore." 1852 Trade card Ebay LL/80006 F.W. & R. King (33 South Street, Baltimore)
The date is based on a newspaper advertisement with similar text - Baltimore Sun, 2 Apr 1852.
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