Q: I mean, it's automatic, quite heavy, works pretty well. I've had them clean in the watch repair shop and they didn't mention whether it's real or fake. It's look real to me, but surprisingly for an expensive watch how come there's nothing written on the back and there's no serie number or watch number.
PS couldn't find watch category so I guess I post it here.

A: serial no on watch need to take off watch strap to see it .rolex web site has more details sounds genuine same as mine heavy etc.

Q: I live in Peru and want to know how much it costs to have a maintenance service for a datejust Rolex wich is running perfectly. I wonder if it needs some changes( o-rings, seals, lube) after 9 years and how much this costs (average). In Peru this service is quite expensive.

A: In the US the base charge is 455.00 which includes all parts except hands and a new dial should you decide to get them. If the lume is disintegrating they may require new hands and dial as a condition of service. Hands are 65.00 and a new dial is 280.00 The base price also includes polishing the case and bracelet.

I have no idea what it would cost in Peru but Rolex is fairly consistent world wide, allowing for currency variation it will probably be in the same area.