The item is a photograph I noticed just laying around in a friends basement, so I asked him if I could research it. Pictures are attached.
AW says: Frederick Keppel & co. were Gallery Owners, show promoters and producers.
They would buy the rights of works and reproduce photos from photographers and artists and exhibit them at shows and then sold them, hence the stock#F 5823. This is what your item is, antique reproduction of an earlier photo.
As an immensely popular President, there are a great many reproduced photos of Lincoln, although your photo of Lincoln is a not an original, there is a growing demand for early photos and yours is by no means worthless.
A classic item like this will grow in value.
Date Range Made: 1890s
Retail Value: $100.00.
Wholesale Value: $65.00
(The midrange price you could expect to achieve at a well advertised live auction. The price that is most often realized)
Quicksale Value: $30.00.
The price your likely to get if you have to sell your item immediately and your prospective customer is aware of your desire to sell quick.
Common Trade Terminology: Lincoln unbearded. Lincoln Portrait Photo in Mourning Frame.
Slang Terms: Not applicable.
Selling Tips: This item would sell best on eBay, or a live auction with like items. You’ve done a wonderful job taking ample detailed pics, if you do sell it on eBay, I’d use ALL of the pictures you took.