Stephen,
You're absolutely correct, 34TB did have the black/blue diabolo prior to the mace badge. The history you mention states the diabolo was worn up to about May 1944 when they adopted the 2nd Army shield for the Normandy invasion and some time soon in the bridgehead they adopted the mace shield, so perhaps from July 1944? What I've not been able to pin down is whether 34ATB, i.e. prior to becoming 34TB, wore the black/blue diabolo.
As to other TBs, 21TB changed from a diabolo to the Gremlin with diabolo badge in June 1944 and 25TB changed to a shield based design but they also morphed into an engineer brigade at the beginning of 1945.
John
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