How to remove "old"/musty smell from vintage bag?

I don't have any quick solutions. Whenever I need to get rid of odors, it takes several weeks. You can try hanging it outside. You can put it in a pillow case and put in the dryer with a dryer sheet. I usually put bath salts inside the purse and then put the purse into a bag with bath crystals. Then I close it up and wait several weeks. Baking soda and charcoal are supposed to absorb odors but I have never gotten them to work. I've used perfume with some success. When the perfume smell wears off, the bad smell is usually gone, but you have to be careful not to spray it directly on the bag as it might spot.
 
This Forum has a very good Search feature. It's always a good idea to run a Search because chances are that someone's asked that question before. In fact, the "Please Read Me First" posts near the very top of the Forum asks that posters do a Search before posting a question, and also explains other important things to keep in mind when posting:
http://forum.purseblog.com/coach/welcome-coach-please-read-me-first-coach-basics-422292.html

Entering "remove odor" into the Search and checking "show posts" brings up 50 posts on similar subjects:
http://forum.purseblog.com/search.php?searchid=22018099

or you could try "musty odor"
http://forum.purseblog.com/search.php?searchid=22018186
 
^Yes, you can send it to LovinMyBags online -- depends on what treatment the bag really needs. They give you an estimate once they have the bag in their hands.