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Your description is confusing. Based on your first picture, this is a print, not a painting. And signature looks part of the print, and not hand-signed. There is a HUGE difference between the two (in rarity and value). Why do you call it limited edition? Is there a label somewhere?
The image nr_digi4.jpg shows hints at a moiré pattern, indicating this to be a print, not a painting, but would need a much sharper focus close up to confirm that.
I too do not see a signature, only a printed name and would agree that certification is always supplied with limited edition print runs at time of original sale.
If such certification has since been lost, then authenticity is harder to verify and the value is lessened.
It is a chromolithograph. A Google search shows quite a few similar results, all with descriptions stating it is rare; but with so many results, I'm doubting the rarity.
Why are two of the pictures exactly the same as the two on Liveauctioneers? Just asking.