Hi Crystal,

Thank you for contacting Mearto with your appraisal inquiry.
There have been a few paintings signed by "G. Winkelberg" that have come to market at auction in the past few years but little is known about the artist and they achieve auction results ranging from $20-200; because your painting is so large, it warrants an estimate towards the higher side of that range.
Based on the photos and information provided, and subject to examination, this is:

G. Winkelberg, 19th/20th Century
Untitled (Canal landscape)
oil on canvas
signed lower right
26 by 54 inches
CONDITION: appears to be in generally good condition; value assumes no chips, breaks, repairs or losses.
PROVENANCE: inherited
$150-250*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, and thank you again for using Mearto.