British 4.2-inch Heavy Mortar

[wally2960]

Hello, recently I bought a mortarmounting and the seller told me that it was of the 4.2". After compairing it with the 1944 pictures of the 2 Kensington ( 49th West Riding ID) taken in Belgium, and already posted on this topic I can't find any difference between the mounting shown on the picture and the one I've bought. But strangely the only marking I found are showing: 1942, MTG 3 Inch Mor.
Is this normal? Thanks Wally