Hi Davide,
Yes. it's a Model WL. Assembled in November 1930 for the 1931 season. That number will be 1654 AGT.
It's very complete and the 'red' (close to maroon) was one of the optional colours available at no extra charge.
I have a 1931 Model WO, which was the 250cc ohv model.
One of the booklets I've written on various Triumph models from 1901 to 1934 covers the Model WL. If you contact me via <peter@triumph.gen.nz> I'll send a list.
Regards,
Peter.
(Triumph specialist for the VMCC of Britain, but now resident in New Zealand.)