Very nice Mm410B. The second one is a model Ms420 built sometime around 1928 according to the serial number. The keyhole in the barrel held a threaded nut to capture a sling swivel which also secured the stock fore end. It is exposed because the stock fore end has been cut back. Rear sight appears missing. I might also add that the value here in the US of the Mm410B with period scope & mounts would be $2000-$2500.