Te koop, maar echt?

At Ebay we found this painting (October 2003):

Oil on panel 10 x 12 inches in fine frame 20 x 26 inches, signed J A Zandleven 1922, listed Dutch master.
First half 20th century.
Painting is in good, original condition (no repairs, no in paint).
Frame is in good condition (some minor chips and scratches).
Fantastic still life of fruit. In a very good shape. Painted by Jan Adam Zandleven in his own specific style for which he is famous. Zandleven is a listed Dutch master (Koog aan de Zaan 1868 - Rhenen 1923).

Is this a real Zandleven? We think a few remarks can be made, justifying the question.

1. The technique. The seller claims: "... in his own specific style for which he is famous. ". But let's compare this painting with three other still lifes from 1922:


'ebay-painting'	JAZ-1922-015

JAZ-1922-024	JAZ-1922-030

We took from all paintings a piece of 20 x 20 cm and arranged the pieces above, in black and white. Immediately striking is the 'smoothness' of the first painting, when compared with the other three.

2. We see also some differences in the signature:

'ebay-painting'

JAZ-1922-030

<- JAZ-1922-015

(the signature of JAZ-1922-024 is very difficult to read

The J of the 'ebay-painting' is almost twice as high as the succeeding letter a. Only in a few signatures we see a clearly higher J.

Conclusion: mainly because of the used technique, and supported by the remarks re the signature, we don't believe this is an authentic Zandleven painting.