Sarco No 1 barrel arrived help identify its origin

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Arrived packed in cosmoline. I've check muzzle with pin gauges and it looks good. I cleaned Knoxx off and found plenty of stamps. I'm looking through Skinnertons book now trying to ID it. So far no luck. I've attached pics if someone can help me while I'm researching I'd appreciate it. I assumed it would be South African but not from what I am seeing.

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I think it's Ishapore post 1950

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Yep Ishy post independence proof mark with the corresponding India post independence owner/issue mark. So far so good. I'll clean it all up tomorrow and see if the bore looks new. Looks like SARCO found some No 1 ishy barrels somewhere.