Belgian made modified No.4. MK2. bayonet belt frog only

Belgian modified, No.4 MK2 socket bayonet frog. Green khaki frog with two large front loops and an eyelet in the upper loop. Loops narrow made to fit the socket bayonet scabbard. Retaing loop. A typical long serial number is stamped faint on the reverse side: 23 52415
It is believed that in the late 1940 only 7.000 No.4 MK2 bayonets were made by Belgium.