I'm told they're Leupold Mark 4 rings but I don't think so. Badger Ordnance maybe?
Update:
I heard back from the seller of these rings and he explained he bought them from a local gunshop back in 2005. According to Scsheriff's post in this thread, these could possibly be the older style Mark 4 rings. I guess my question now would be if they are worth $80/shipped?