RHA Stamp on Harrington Bar??

Hi all, does anybody know what the RHA counterstamp on this Harrington 50oz Silver bar stands for? ive done a bit of googling but cannot find anything about it?
Also, what is the reason for these bars having a counterstamp on them (RHA, DCL ect...)
Thanks guys appreciate it !
 

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refineries need to make bars for other institutions... good example ABC, PM and JM refineries, they make bars for others for a limited quantity... but not always the case too..
 
the 50oz is more common with <250 made, the 2kg is the rare one with <25 made.
 
Just found this :)
I'm glad you reposted my facebook comment here. I'd meant to post the connection I found between DCL and RHA in silverstackers back in July 2021 when I first found that old advertisement, but totally forgot about it, then last month I saw someone asking about it in a facebook group and posted it there and again I forgot to post it here.
 
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