A beauty! I am a new Martini owner also! I recently bought a Cadet in .32-20, but traded it for a #12 before I ever shot it.
I took my #12 out today, and with my Win. 52B Heavy Target as a comparison, I was quite surprised! The #12 will hold it's own against what I had always believed was the finest shooting .22LR I owned! At 50 yds, with the Parker Hale rear sight, with adjustable aperture, and globe front sight, the Martini shot groups of about .75"! The Winchester has the Marbles Goss rear sight, and Lyman 17a front sight, and I could not outshoot myself against the Martini.
Hope your's shoots as good as it looks! Mine is not nearly as nice looking. Someone has bead blasted my gun, and refinished it flat black. I assume it was rusty or poor finish, which lead to the matte finish. Doesn't affect the shooting, but I envy your good looking gun! Mine is also straight grip stock.