That is a very nice 5th Class of the Order with Crown with pendalia and swords above the cross
That Model appeared late in the King Boris III period 1918 -1943, and during the Regency period 1943-1946 ( after the death of the King Boris III)
From this model are known only crosses from 5th to 3rd Classes This model is rarer then the one with crown without pendalia
Some authors state that this model did exist only in the Regency period During the Republican Period the Crown was replaced with a Wreath
Note; The box on the first picture is from the Republican period, however the Commander Cross is from the periods discussed above