UK - I have the chases, what is the press?

I have three chases, 2 plain and 1 screw that have eternal dimensions of 7 3/4” x 9 1/2” and internal dimensions of 6 1/8” x 8 1/8”. The top and bottom edges are tapered. On each side is a wedge shape which I presume locks the chase in place as it sits vertically. Two chases are stamped with what appears to be a cap E followed by H5.
Instead of the back being totally flat they have two raised sections adjacent to the inner edges of the narrow sides. They are about 1mm higher than the rest of the chase. I have chalked these to make them clearer in the picture.
Has anybody any idea as to what press these chases belong to?

image: Chases1.JPG


image: Chases2.JPG


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Hohner tabletop press chases have those triangles.