In order for me to properly assess what you have I will need to see images of the front, back (do not remove from frame) and a clear, in-focus close-up of the signature.
If you had already attached images to your initial posting, they are not showing for me here on my end.
Please send the photos at your convenience. There is not an extra charge to provide more pictures here.
That is fine, you can send images at your convenience. No rush - there is not a time limit here.
Does yours resemble these in the link:
These photo montages that were published by Knaffl & Bro can sell for an average of $50 - $100 for reprints from the 1950-1960's and up to $225 - $300 for originals from 1898. I can help confirm what you have if you would like to send images. There is not an additional charge to add pictures here.
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I received the images, thank you. Yours is a 1950 - 1960's reprint of the 1898 photo series. They sell for $50 - $100 each on today's market.
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Please let me know.