What is the crystal size for the XX007344 ???

You can get crystal on line you just need to know the size I have replaced many I always save the crystal out of watches that don't work .You Tube has many videos on how to do this you can pick up watch tools on Amazon pretty cheap even Harbor Fright has some tools Good Luck

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In order to replace the crystal on your watch you are going to have to remove the entire movement and use a watch press to remove the crystal.
this is not an easy job and should be done by a professional
First you will need to get a watch back opener to unscrew the back of your Tag. The three slots should fit into the back of the watch. tighten the opener until it is firmly on. then turn counter close wise until back of case comes off.
Next you will need to remove the watch hand and crown. Becareful doing this for pressing to hard will break your set leveler. You will need a thin pin pusher and look on the back of the movement for an arrow pointing toward a hole in the movement. Push down and at the same time pull the stem and crown out of movement. turn the watch right side up and the watch movement should fall out. Place movement on a very safe spot so not to damage movement or dial
now you will you be ready to remove crystal Since it is a friction crystal you will need to do use a watch case press . find two die that fit exactly the watch and crystal use a scooped side and place it on the bottom side of the watch press. Next use a flat die to place on top of the case press. place the watch face down. you will be pushing the watch crystal out from the top. Press down on the level and check to see if the crystal came loose, keep doing so till the crystal comes out.
finally you will need to measure the thickness and diameter of the crystal and find the exact size. I believe this watch has a sapphire crystal so you will need a sapphire crystal too.
Once you buy the proper crystal it is time to put the it in the watch. Place the watch face up in your watch press. and slip the crystal in through the top making sure its perfectly even all around. Slowly push down on the leveler until proper pressure is applied and the crystal snaps in.
Now you have new crystal . Clean crystal thoroughly and the inside of the case. Place watch upside down carefully place movement back in. slide spacer in . Now slide watch stem and crown back in push down again on the set leveler with pin pusher.
Place case cover on back and tighten properly to prevent water or moisture from entering and you are done.
This repair should be done by a professional especially on such a nice watch. Any watchmaker can do this job and will have the tools to do it properly

Here in U.K. fitted crystal would cost you £15-£20. Crystal only you can find on ebay for as low as £1-£3, but you need to know exact size.

Watch crystals are pressure fitted to their cases so that they are resistant to popping out. Think of a champagne cork, and how it expands when it comes out of its bottle.
Crystals are set into cases in one of several basic methods. First, a crystal may be installed from the back--watch cases are commonly assembled before the movement is installed. So, one potential way of reinstalling your crystal is to remove the watch movement from the case (if it isn't already) and try pushing the crystal from the back forwards. If this is indeed the way it was installed, the crystal should pop into position with a noticeable click or light thump to let you know that the other edge of the crystal has found the shallow groove in which it's supposed to sit.
Second, some crystals can be installed from the front using a tool called a "crystal lift." This tool has many little fingers that compress the edge of the watch crystal so that it can be slid into the case. Pressure is then gradually removed from the crystal, permitting it to expand into the shallow groove into which it's supposed to sit. Crystal lifts are easy to use in theory but somewhat finicky in real life; the crystal must be grabbed equally by all the lift prongs or else the crystal will have a tendency to squirt out of the tool before it's been completely set.
Looking at pictures of your wife's watch, it doesn't look to me like a crystal lift would do any good. I think instead that your crystal might have been installed using a third method. Looking at the pictures, it looks like the bezel--the metal top of the watch--separates from the watch body. If this is the case, gently pop off the bezel and push the crystal into it from behind. Then, push the bezel back onto the watch movement. It's possible that the crystal is kept in place by being squeezed between the bezel and the rest of the watch case.
If all of this sounds daunting, putting the crystal back in--assuming it's not cracked--is a minor job for a watch repair technician. It literally might only take 5-10 minutes to complete the job. If you're concerned about the appearance of the watch, it might be safest to pay someone the small amount of money to get this done right. Replacing a watch crystal with a new one usually runs about $15-25, around where I live. Replacing an undamaged crystal that's popped out should cost appreciably less, since a new crystal costs a jeweler between $5-25 for most standard sizes (diver's watches and strange specialty shapes will cost more).

Thank you for contacting FixYa.
Most cosmetic on watches (crystals, bands, etc) are not usually covered by the manufacturers warranties. Check around with most local jewelers, or try a local craft shop for a bag of similar size crystals. Prob cheaper to do yourself and have extras for the next one to pop out.
Jewel

I am not sure about prices in US, but over here in England we charge £15 - £25 for mineral glass (depending on size, thickness, e.t.c.) and £50 - £120 for sapphire glass. As for today: £1 = 1.60$. Doesn't matter how you name it - glass or crystal, both are right.

Examine the markings on the battery. It is likely to be a 1.5-volt Silver Oxide or Alkaline battery. It doesn't matter which one you use, although the Silver Oxide battery can handle heavier energy-consuming loads, such as a multifunctional chronograph. It can be purchased from amazon, here: watch battery 1 5V silver oxide 357 SR44 SR44SW 10 pack. I hope this was helpful. Cheers
Simon

I'm afraid there will be no good reason to explain where to get the exact crystal for your watch as plenty of special skills and tools are needed to replace it.
The best solution is to find out your nearest watch repair shop and ask for replacement. Any decent watchmaker can do it.
If you want this job done by Bulova itself, visit this site:

www.bulova.com

Here you can contact them and find whatever you want, even your nearest Bulova service center.
Do not forget to rate, please.