They are designed to hold the 15 round mags for the M1 carbine.
This particular type of pouch was made with a very wide belt loop. Soldiers in the field sometimes used these by sliding them over their stock so they would have ammunition close by. They have a snap on the back.
These were made in 1942/1943 by different sub-contractors for the US Military. They are in Excellent/Mint condition and most appear to be unused. Some have light verdigris on the snaps and metal. Others may have some stenciling on the inside or back placed there by the military.
I do not have many in this excellent condition
I will honor requests for specific sub contractors IF they are available. If they are not available then orders will be filled with the next subcontractor in the pile.
THESE ARE NOT REPRODUCTIONS!
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Note: All prices in US Dollars