Never pay down a deposit in a bank account until you have met the seller, seen signed a purchase agreement.
No serious private advertisers ask for a down payment before you meet.
Receiving an email with an in-scanned ID does not mean that you have identified the sender. You do this on the spot, when you sign a purchase agreement.
For sale: a great violin with a bright sound. Suitable for a child in sizes 3/4 and 7/8. The set includes two bows, a bridge, rosin, and a case. You can come and see, play. Wakertone, USA.