Hi Richard
Thanks for showing them, there seem to have been quite a few insignia manufacturers in the Aligarh area as the marks often come up on British Army badges made there, but it's the first time I've seen a button with an Indian maker. Quite unusual. The RNAS button might be late war as the quality isn't great so possibly a small maker who got a contract due to demand? Very nice.
Cheers,
Alex
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