This M28 has correct frog (rough side up) and (very) green scabbard. This scabbard is painted over original black finish, which is visible under the frog. I think it is period painted, since it show wear and the bayonet is straight from Finnish Army storages.
"KE" stamped M28. Scabbard has interesting period welded fixtures, used maybe in a vehicle. Note correct forest green color on scabbard.
M28 bayonets were manufactured for Suojeluskunta (Civil Guard) only by Hackman.