I came across this today >
https://www.ebay.co.uk/itm/267459779956
which I thought might be yours - with the top ending
in ORD lettering, but the rest does not quite look like BRADF and
also the lower part on yours looks shorter than the top.
Whereas what I saw today is the other way round - short over long
so yours was never issued like that; it has been over-stamped.
Both are on here
N#474011 [normal]
N#18029 [over-stamp]
Neither looks like your lettering, but it may be a start.
Diameter and weight different, so may be another denomination - or something else …