Singer 411M made in Italy. Unusual in UK, but I bet there are plenty undercover in Italy: )
The 411 machines are basically 401s, with the additional ability to chain-stitch. With the correct original throat plate & hooked bobbin case, of course. It is also capable of treadling with the correct hand wheel assembly: )
(See an Original treadle spec. 411G here on this site. A truly versatile treadle machine)
Underside showing the all metal gears & alloy body. 
Lapped bevel gears provide reliability, precision & long life.