I have two of that style, one is left hand and one right. They are black in color and fit a K frame revolver, my model 10 four inch heavy barrel specifically...they cover the revolver completely. I got both from an ex Oregon Policeman that had them in his accumulation.
By the way, mine are the 54M and 54M LH, I wonder if that means 4" compared to the 56M being for 6"...M being medium frame?