In the absence of seeing it in the hand, its most unlikely to be hand made or indian. This level of accuracy in the detail, not just in the radial lines but elsewhere indicates another method of making.
Theres a very small chance its been cast, but its really too precice to be anything else but die struck. even if its 100 yrs old that takes us back to only 1918, when 3D die striking was very well developed.
To the point of 3D die sinking and reducing from a 4 to 6 times larger master patterns using machines that were in wide use here in the UK and on the E coast of the USA.
I currently can die strike up to 4in wide by 6 in long ovals to this level of detail and much more using my machines dating from 1880.,. As far as im aware im also the only die striker here on this forum. Dont post regularly any more for sad reasons. Also not being interested in using stones so just about all bench jewellers posts are irellevant to me.
As Elliot has written, a picture of the back may give more info how and maybe by whom it was made.
I know die striking when I see it,
as many of you may recall, its what I do.
Ted.
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