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.
Selling electronics: Smartwatch, Nintendo Switch, iPhone 8, DJI Osmo Mobile 6. Excellent condition, complete set listed. Novi Sad, Jugovicevo. Self-pickup.
