I need to take the movement out of my ladies rotary lb77835 has to come out of the front but not sure how thats done

The serial number and the name don't bring any information. Check eBay and filter by 'Sold'. That will give an indication of prices realized.

https://www.google.com/search?q=rotary+ladies+vintage+watch+value

https://www.google.com/search?q=rotary+ruben+watch+serial+number+L89137

..

This site gives maker information, but the serial number help is just waffle.

https://jules-jurgensen-serial-number-list.peatix.com/

To find what it is, click the images tab

https://www.google.com/search?q=Jurgensen+Ladies+Swiss+Wristwatch+17+jewels+rectangular+movement%2C+14K+gold+case

https://www.google.com/search?q=jurgensen+ladies+swiss+wristwatch+serial+number+lookup

..

help here

https://www.google.com/search?q=ladies+Longines+Presence+watch+battery+replacement

HOWEVER, it is such a fine maker...
Changing Watch Batteries
Lots of posters ask "what is the battery in my (name of watch)" with a view to changing it yourself. This is a bad idea for many reasons. You don't have the tools or knowledge to remove a rotary screw on back, or the gasket sealant for a waterproof watch. Some fashion watches have 4 traditional screw and need professional grade jeweler screwdrivers. Also, there are about 20 batteries commonly used in watches, in various sizes and internal technology, Lithium Ion, Silver Oxide and Manganese Alkaline. If you buy them, you generally have to buy 10!

Don't sweat the details. Just take the watch to your local jeweler. They have all the batteries at hand and the tools to remove the back. It is done whilst you wait for $8 to $15!

Posted by ADMIN... on Dec 31, 2018

Ceas barbatesc elvetian ROTARY cu data ETA cal 555412 7 rubine

The incabloc movement is not too expensive but it sounds like your watch is! I am not sure the movements are available for the older watches anymore, your watch will need the right measurements, so if you take it to a watchmaker they have many older parts and may have a watch movement to fit it! The picture in my profile is of a very expensive 6 ounce gold ladies watch with an incabloc movement. The watch was thought to be from Europe somewhere , it was sold for its beauty and the movement itself did not work! Hope this helps explain your problem a little better! thank you!

A watch with no movement in it is probably a salesman's sample or display model. These are often distributed to stores as part of a larger display. In addition to missing a movement, you should also check to see whether the hands have been glued in place. This is also often done because, without a movement, the hands would just flop around instead of staying in an attractive position.
Watch movements come in a variety of standard sizes and shapes. However, a standard ladies watch movement (made by many manufacturers) would probably fit your watch case. This size movement is today used in much larger watches, too; the movement is simply anchored by an appropriate spacer.
A jeweler advertising watch repair should be able to offer you a price on this job. If the hands have been glued to the dial, it may not be worth "upgrading" the watch because of the additional expense and potential damage to the watch face from getting the hands freed up.
If you're ambitious and want to try it yourself, movements can be found online at a variety of watch supply houses like Otto Frei. You can also buy a cheap new or used watch at a flea market or thrift store and use the movement from that. You might be able to re-purpose the spacer in that watch, too, by trimming it to fit your watch case. The major stumbling point here is that watch stems--i.e., the stem on which the setting crown is located--are usually custom-cut in length to match a specific case, and the one you select may be too long or too short for your case. A watch repair place should be able to replace the stem and crown for you, if you need that service. Trimming an overly-long stem is a very simple and cheap procedure; replacing the stem requires a new stem, which will add to the cost of the repair.

Rotary do not seem to list instructions for individual watches but do offer general instructions.

To see these go to http://www.rotarywatches.com/en/service/rotary-watch-care#instructions .

\i hope his helps.

Go to the Rotary web site http://www.rotarywatches.com/en/service/rotary-watch-servicing and contact them to discuss your problem.

I am not sure which Vincente model you have but I can tell you that the movements for those are Swiss made. That may not seem like much but there's not a lot of info on them.
Chances are it's an ETA movement and if not there's an ETA movement that should fit it. ETA is one of the top Swiss movement makers around. You will find their movements in more watch over $1500 then I care to mention. You should be able to get a movement for around $150 plus installation. You will need to go to a watch repair shop so find a good one.
Hope this helps.