PB 12 and 22 were the only two Btlns to carry the crossed pick and shovel.
I know this is an old thread, but I thought I would correct this statement, should anyone read this at a later date. There were actually quite a few more Saxon pioneer units that wore the crossed pick and shovel. Though the 12th and the 22nd were the prewar parent units, Saxony formed other battalions and independent companies during the war. Here are my M15 examples of the aforementioned battalion straps as well as one from the 44th Battalion.
To complicate the chances of getting a pair from one of these units is the fact that the straps came in a right and a left.
Chip