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Richard Harmer
A composition of shells by Harmer published by the London Stereoscopic Company
1857 (ca)
Stereoview
Private collection of Paula Fleming
LL/83502
The subtle tinting of shells in this card is easier to view.
Paula Richarson Fleming, July/August 2009 , "The Iridescent World of Bi-Colored Stereos", Stereo World, vol. 35, no. 1
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LuminousLint 
@LuminousLint