No there is nothing but a coil.

It is a moving iron meter. From the information above, the full scale deflection current is 4.3 mA. You can not make it more sensitive than that without extensive modification; i.e. rewind the coil with lots of really fine wire.
https://electrical-engineering-portal.com/moving-iron-instruments-voltmeter-and-ammeter

 

Also, looking at your scale, it says "AC/DC" which means to me that there is some circuitry inside to rectify the AC to DC

The movement looks like a moving iron type rather than moving coil, so no rectification would be necessary.