I've looked in loads of modern reference looking for a similar name, of that vintage, and not found anyone who seems a shoe-in. You must know that it could be by an amateur - that doesn't make it any less of a painting, or any less good - and that would mean you've very little chance of tracing it.
There are what seem like squillions of artists - of varying qualities - who have produced shedloads of paintings of Venice, and believe me, many of the "professional" efforts would make you weep! Almost all seem to include the campanile in St Mark's square ( unless they are of the rialto bridge!) so the subject won't narrow it down a lot, sadly.
I think "Riccione" the place, isn't all that far from Venice.
Don't worry if you can't decipher the signature. Enjoy it.
If you're doing painting workshops at present, perhaps the next idea might be to go to Venice, take your paints, try to identify the viewpoint either on the spot or using something like Googlearth or the Venice connected camera tours, and then do your own modern version of the same scene! Could be a splendid holiday souvenir. But be warned, even Canaletto, Guardi and Turner "moved" bits of buildings round to suit the composition they wanted. It might not be very easy to pinpoint the exact spot from the 1920s.
