Unlikely, I don’t see why would anyone mark the magazine Patchett if it wasn’t a Patchett magazine. The Indian made mags are clearly marked MAGAZINE 9MM 1A 34RDS for their 1A Sterling copies, and the Canadianmags for their C1 are different.
The Sterling was still known as the Patchett Machine Carbine in 1952 when the helical spring magazine was patented.
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