Savage started putting a low profile sight on the Fs to allow for scope clearance. I saw one of those counterfeited and sold on gunbroker quite a while back. It showed up again on ebay and I messaged the seller, as a bunch of others did, that it was not a bonafide T sight. The notch was still in it but it had been milled and the white line added.

The poor guy that was duped sells a lot of stuff on ebay. He professed to knowing all things Winchester but was a Savage novice.