Scarce 1930's Remington UMC “Dog Bone” 257 Roberts Mushroom Bullet Model 30

This is a full box, 20 rounds, of .257 Remington Roberts ammunition manufactured by Remington.  The 1930's one piece green, red and white “Dog Bone” Kleanbore logo Hi-Speed box is in excellent condition with bright color and crisp graphics with minor edge wear having a call out for the Remington Model 30 rifle with end flaps are marked “HI-SPEED MUSHROOM”.  The cartridges all have matching head stamps with one appearing to be the original loading with flat primer and the balance likely reloaded with oval primers and different hollow point bullet showing some age darkening of the brass.  A classic “Dog Bone” box in a scarce caliber.