The Blue Book of Gun Values shows that it started out as "Model 70 Standard" made in 1965. They were available in several calibers including .243 Win. Looks like they were all 5 shot, had a (22 or 24 inch) heavy barrel, open sights, and a Monte Carlo stock with sling swivels. Mfg. 1964-1980. The "plugged" holes in the barrel would have been for the open sights. Hope that helps a little. - Bob