Our family doctor was an officer in WWII attached to the small arms plant in St. Louis where he worked with Winchester across the river in Alton on the development of a 60 caliber machine gun using a 50 cal Browning as a start. He told me the design failed because of breech failures. For his efforts, Winchester gave him this nice display box of ammo as well as some presentation 60 cal. rounds. He gave me the display box after administering a small-pox inoculation to me.
The cartridges are held my black elasticized thread that I had to replace some years ago as it had deteriorated. The numbers under the cartridges are keyed to a chart on the underside of the lid that list each by military designation with load.
A very nice piece with fond memories of a family doctor and friend of my father who made house-calls on Saturday in his Olds 98 to treat my dad and grandmother. He had coffee and cake after his work was done. It seemed to me he wore a suit every day of his life with starched white shirt, french cuffs and a Countess Mara tie.