Hmmm,
that is a puzzler.
A whole lot of standing around; not many in position; between innings?
I would like to throw my hat in the "dating" game though.
My guess might be mid 1860's; in that C.D. Fredricks, generally acknowledged as bringing the CDV "technology" back here; from his experience in Paris; created this CDV from the Annie Speed portrait (she commissioned it from Fredricks); the first known image of Lincoln following his inauguration, March 1861. Allowing for this new technology to spread; in spite of Fredricks' attempts to "Patent" CDV's under the name 'Specialite' (unsuccessfully, BTW); there was no such thing as ownership of intellectual property back then. Yet Fredricks attempted to do just that. I am guessing that delayed the CDV "technology" from spreading quickly.
Ben
"I love baseball history backstory; especially when it involves cards."