For sale: Moye kids' watch with camera and call function (sale without SIM card). Good condition, bought in September, but the child did not wear it to school, so it was used little.
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.