British Navy GSM abbreviation

[vitharr]

Hello everyone
recently I saw on a Naval General Service Medal the abbreviation N.A.I.M (A) R.N. I understand that RN comes from Royal Navy but what means NAIM(A)? Is it a rank, a function?
Thank you
All the best
S. Botan

[vitharr]

a picture of the rim engraving

[escosis]

I think it is Naval Airman Instrument Mechanic ( Airframe ) .
Regards .

[vitharr]

This is the medal I have recently acquired. How could I be able to find a little something about its owner - E.V. OSBORNE?
Thank you
Sever