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.
Safety first! I will sell a basic set of protection (knees, elbows, wrists) for rollerblading Firefly LEISURELINE 2.0. It was used for about a month. Condition - in the photo (actually excellent, but there are a couple of scratches). I'm selling it because my husband bought himself another protection that he liked more. Size - L. You can try it on, see it in...