Hi Penny. Thanks for your reply with the additional information. It's of value to know that yours is 7 years old and indeed is based on Nickel. Without being an expert, the switch from Ni to Ag as core shielding element seems like an upgrade not a downgrade.
And no, I wasn't nitpicking on you at all, Penny - I very simply felt insecure because two pieces of the puzzle didn't quite fit together. As you surely know, too: der Teufel steckt im Detail
Thanks to your clarification, we now feel confident enough to order the current Ag based Brain coat.