Polish or natural?

[5 cent player]

Question for the experts. I have had this Jennings Duchess for a while now, should I leave it the way it is or polish the aluminium case? It works great and seems to have been restored sometime in the past. The paint is not real good, thin in some areas, and not really in the lines. The arm and coin inlet have a light golden color to them and i am not sure why, age? thin paint? plating? The wood is in great shape along with the mechanism, i play it all the time. Thanks for any thoughts or insight. If i do polish it I will try to respond with more pictures if anyone is intersted. Thanks