My 1950 80" also has the 4 digit no stamped on the L/H engine mount I have also seen them on a number od the Au 80" LR's, in the 35 years I have owned the LR no one has been able to tell me whatb it is . They are 1/2 the height of the chassis no stamps. I always beleaved they were a stock no but don't quote me on yhat
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