Transcribe only what is legible
The old address mentioned the nineteenth century and “Dupra”. Without readable photographs and an object record, neither statement is established here. Note the letters that are visible and identify uncertain ones. Similarity to a known name does not prove authorship. Ask for unfiltered images of the inscription and the whole painting.
Separate painting, support and frame
Measure the canvas and frame independently and request views of the reverse and edges. A frame may have been replaced, so its style cannot date the painting by itself. Ask for known repairs, surface losses, distortion and work to the support. Keep these observations separate from the proposed artistic attribution.
Assemble the evidence before purchase
Store photographs, descriptive title, dimensions, stated medium and supplied documents in one file. A receipt, a family account and an expert opinion provide different kinds of information. If authorship drives the purchase, have the evidence assessed first. For decorative use, also consider viewing distance and the final hanging arrangement, with a fixing method suitable for the actual wall and weight.
For the next part of your selection, read Antique paintings for hotels: planning a coherent collection.