Hi, I would avoid the early 27MHz Tank/Transmitter combination,
This uses Crystals and has a very limited range it also can be picked up by a stronger Transmitter or one that is nearer to you so that you lose control of the Tank.
Also the Control board of many early Tanks had everything soldered in place whereas the later Control boards use a much better "Plug and Socket" system,
The later 2.4 Digital Control Board means that your tanks frequency is unique to your Tank and cannot be accidently taken over by a stronger Transmitter and you also have the capacity for an extended range.
You will not get a fair feeling of what a current 2,4 GHz Tank/Transmitter combination offers if you buy an early model.
I have no knowledge of the Italian second hand/used 1/16 r/c tank market so I shall leave that to your judgement,
But I would go for a Tank that is popular such as a Tiger 1 from Heng Long or Taigen and you want one that has the most up to date control board you can find,
If you buy a less popular Tank it might be cheaper but it will probably not be as up to date as the faster selling Tiger 1 which has the added advantage of being roomier inside so that any inexpert fumbling's are less likely to break anything, and if you do like our hobby there are more upgrades for the Tiger 1 than for any other Tank in 1/16 r/c.
You need to know that the Heng Long Control Board (RX18) has been updated many times over the years and so has the Transmitter which means you need to buy them as a working pair, if you don't your Tank might work but you could lose some of the updates in the newer Control Board.
Good luck and a belated welcome to the Forum,
Shaun.