hi i have a large oil painting signed canaletto.I have no idea of the worth. Here is a picture
I am familiar with two artists called Canaletto.
Bernardo Canaletto Bellotto (1720 - 1780)Italian
Giovanni Antonio Canal (canaletto)(1697 - 1768)Italian
They are both very expensive but I am pretty sure that this is not a work by one of these. They painted in a very different way.
Either you have an art piece by a relatively unknown artist or somebody signed the work with the name Canaletto in an attempt to increase its value.
Best Regards, Soren