While it could have been Struck Through Grease, its sharp margins suggests that it was struck through a floating encrustation. That's basically a flake of "grease" that separated from some part of the press. Floating encrustations are most easily diagnosed when they appear on a second strike and not the first, and when both strikes were delivered by the same die pair.
The impressions of floating encrustations are incredibly common on Indian multi-strikes. Evidently their presses are filthy and constantly shedding flakes of compacted gunk.
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