That's a new one for me. It's likely a local initiative. I seriously doubt Thorens got affiliated with Grace, especially when the TD-125 was still in production.TD 125 GRACE badged model
I've seen these Grace "badges" with some of the cartridges. It's likely some dealer or buyer just stuck the badge to the armboard. I have never read/seen that it was anything official...and I've worked on a few hundred 125s.
Dave