Oil on canvas, Landscape with boat and figures, 58x82 cm, signed "Hans Dahl." Analysis of the painting did not show any changes, but in the lower right corner seems slightly duller than the painting in general. Microscopic examination shows that the signing is fused with the painting. This indicates that the signature is painted there, then the painting was performed. The signature would then be original. It is probably a copy made ​​in the 1890s. The painting is performed on a type of canvas started to be used from 1870 to 1880. It is naive painted by, probably, a provincial painter who lacked an eye for detail. The painting is thus a copy without it having stated. Hans Dahl was a famous Norwegian artist. He was a pupil of Hans Gude, who belonged to the Dusseldorf School, active 1840-60. This painting is typical Norwegian. The District Court's assessment: The painting has not been described as a copy. Therefore, it is a counterfeit.

Oil painting on panel, portrait of a young woman, signed "Hans Dahl", size 15,5x10 cm. The painting was sold at an online auction house in Stockholm Sweden autumn 2013, price SEK 2,200 (about 240 euros). The purchaser who lived in Norway doubted the authenticity and contacted experts for examination of the painting that immediately noted that the signature was painted later. The purchaser returned the painting to the auction house branch in Gothenburg and got the purchase price back. The painting was handed over to the police.

Oil on canvas, motif with man and young woman in a sailboat, signed "Hans Dahl", size 100,5x150,5 cm. The painting was for sale at a major auction house in Stockholm, Sweden in spring 2012. cataloged as "På fjorden" Estimated price SEK 80.000-100.000 (8.800-11.000 euro). The staff at the auction house suspect, however, that the painting was not genuine and contacted the police for further investigation. Both the technical investigation and experts have examined the painting. The motif of the sailboat is a copy of Albert Edelfelt painting "At sea" located at the Gothenburg Museum in Sweden. The painting has been provided with a forged signature in order to lull potential buyers in the belief that it is a genuine painting by Hans Dahl. It is a forgery and has been forfeited.