It is a repack. The only way to find what is inside is open it and inspect it. When a repack project is done, all makes and conditions can be repacked for storage and future issue. One can open a repack and find a used item.
Your repacks on top either came from me or are mates to mine. At one time I had a couple hundred of these, they came from Navy Second Fleet.
Of the ones I opened, I found that most were reparked BRW S-I. I found several other makers, along with a couple that were used, and a couple that were unmarked.
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