Hi Dee,
There are two reasons why I think my Amberina 269 bowl is not by Davidson. Firstly all other examples of the 269 pattern have a toothed decorative band on either side of the prunts. This bowl only has one. Secondly The angle of the prunts with respect to the body of the piece is different. On other 269 examples the prunts are almost perpendicular to the surface. On the amberina example they are at much more of an angle.
I have seen one other exmple of Davidson amberina (Bernard can you remember what style it was?), so I do think Davidson did some experimentation, most likely post war.
Regards
Chris