huvius. i have never seen one on an early rigby but i have seen an extended tang for a saftey as mike scwandt has one on his site right now its a 7x61 S+H , the pic you show looks like an early 350 magnum is it ? i,m sure it could have been added for a customer as the guns were built to order,...contact paul roberts at jeffery rifles he,d most likely have the answer.......paul