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A personalized engraving on the back of a watch case means nothing as far as its authenticity is concerned. Think about it an engraving can be done at any time after the manufacture of the watch is completed so how could an engraving or lack there of tell you anything about authentic? I bought an older Day-Date President a month ago and it had the persons name, birthday, and SOCIAL SECURITY NUMBER engraved on the back. What is interesting about this particular engraving is that it is a fairly bad engraving. Which means that an unskilled person did the engraving, but that is all it means. The particular watch I am reffering to is very real indeed. All that aside I'm going to say that your watch is fake. That is a 20K watch and the fact that you don't know how the engraving got on there indicates that its more than likely not real. That's also one of the most commonly counterfeited Rolex's. If you wanna know for sure take it into a pawn shop and tell them you want to sell it. Just don't argue with the people when they tell you its fake.
The Proper way is with a "watch case wrench". They can be purchased for a few dollars on Amazon and E-bay. In most cases unless you are changing many watch batteries the best option is to call around to local jewelers and pawn shops and ask how much to replace a watch battery. In my town it ranges from $30 to as little as $5.99 battery included.
If the back of your watch is completely smooth, the odds are that it has a snap-fit case. Screw-back wristwatch cases generally have small indentations in the case back into which you fit a case wrench. Rolexes have an elaborately ridged edge to their case backs and take a special wrench. A few early water-resistant watches have little screws that hold the front and back of the case together, but these are usually quite obvious, and you didn't mention them in your description.
Most "fancy" ladies watches of the 40s, 50s, and 60s, had snap-back cases. To open one of these without damaging the case, I recommend gently working a decent quality case knife into the crack where the case back joins the case and gently levering up. If the case is really snug, you may need to do this in a few places to gradually pry apart the case halves. Often, the best place to do this is at the lugs, because they offer a leveraging point. I don't recommend doing this with a sharp knife blade, as the resistance from the case will probably damage the knife edge, and if the knife slips, it can easily scratch the case. If you don't have a case knife, try using the rounded edge of a butter or table knife. Do not use a flathead screwdriver blade, as the short width of that tool can easily place so much pressure on a small section of the case that it deforms and can never be made to look good again.
Determine the type of case back on the watch. Set the watch face down on a soft surface and look at the back. If it has slots, it is defined as a screw-back case. If it is smooth, it is defined as a snap-back case. 2
To open a screw-back watch, use the metal blade of a standard screwdriver to turn the slots counterclockwise. A case-back wrench, which can be purchased at watch-repair stores, can also be used. Set the metal tips of the wrench into the back's slots and turn it counterclockwise to open. 3
For a snap back case, place the metal blade of a standard screwdriver in the indent between the watch and the case. Gently apply pressure to lift the case up and off of the watch. 4
Close the case back by setting it back onto the watch. For snap-back cases, line up the indent on the side of the watch and press gently on the case back to close. For screw-back cases, use the screwdriver blade or case-back wrench to turn the slots clockwise, thereby closing the case shut.
If it is a screw down back you will need a case-back opener (sold at Harbor Freight for $2.99). It is adjustable to fit most case backs. Make sure the wrench fits the notches on the back and rotate counter-clockwise If it is a snap on case use a knife type case back opener. Look for a small indention on the case-back that allows you to snap the back off. (some watches have the indention, some do not) You need to be very careful not to scratch the back
You may need a case-back press to put the snap case back on. Some you can snap on with your fingers other will require the press.
You definitely need special Rolex case back opener. Without it your watch will be locked forever. Rolex cases are so tight, that even when special opener is used, you will need quite strong arms to open it. Rolex case openers sometimes sells on ebay, but they are never cheap.
An authentic Rolex will have a screw down back with
exactly 144 small teeth. You can only open a Rolex case with a special
Rolex tool (Key). We use the Bergeon hand wrench to open Rolex cases. Supplied with 6 Bergeon
grooved chucks(18.50, 20.20, 22.50, 26.50, 28.30 and 29.50 mm), these
are the same chuck used in the Bergeon 5700RO and will fit in the
Bergeon Bit Adpater for 5700-Z Case Opener our number FB-231.
Replacement chucks and replacement handle are available in case you
have a set that is missing a piece. As is the case with any fine mechanical instrument, special
tools are required in order to properly service and adjust a precision
instrument such as a fine timepiece. If you are not experienced, it is better to leave this to a Certified Rolex tech. If you do feel you want to proceed, this tool will set you back about $140.00 or so. Just as the internal parts of the Rolex are exact, so is the watch case
that protect the valuable watch movement. These tools are used to open
the Rolex case without causing expensive damage. You can call Bob Frei at 510-832-0355 ext. 2 from 11 AM to 5 PM Pacific Time Zone, to order one if you wish, or several other sellers of these fine tools can be found by doing a little research on the net. Hope this has helped you.