In July 2014 locky666 from Germany was trying to sell this „Egyptian license plate“. It is probably from Egypt from the style but it is not a vehicle license of any kind.
The Arabic is D W – W A Y 50. Individual letters not words.
It could be from a boat (but I would expect it to be more rusty) or a house number or maybe some piece of public works infrastructure like an electric box or pole, a water valve, etc, etc.
Always check with the likes of Francoplaque if you don’t know the plates from a country you are thinking of buying.