Unbelievably Naff.... after I stopped laughing... and a couple of mates who collect had stopped laughing.... I would comment as follows:
BR, LMS, GWR...etc DID NOT allocate engines to drivers and certainly did not have pay checks specific to them. The practice of allocated engines to drivers had stopped by the grouping in 1923/4 and even when the practice was going on the check did not reflect the drivers loco. The 3 locomotives were nothing special in railtour or special use terms and were never allocated to any common to them all sheds (checked 1948 to 1967 as I have full BR records for every engine and shed allocation) and all were built post 1923, hence there can be no link between them or say a common driver .
I have 200 of these things and not one looks like those... nor do any of my mates!
I have a Saltley check with the type face stamps shown (but that is NOT common 1 out of 200 and some were stamped).
I have just been up town and based on the size I think these are dog collar tags which my local shoe repairer sells for 20p a blank in alloy, brass and steel with the same little hole. I think these were stamped /messed with then thrown in fire , brasso'd back and then perhaps lightly patternated....
Nothing about these is right!
below is a random Handfull of mine.
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Oh added a close up of typical:
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Aaaaaaaaaaaaaaaaaaagh Creeper!!!!!