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Looking to the watch community for help with this (hopefully simple) repair - I recently bought a Girard-Perregaux 3719 dress watch however the crown was loose from the movement and comes completely out of the watch. The movement appears to be a Girard-Perregaux 101-274 (Peseux 7001): http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&0&2uswk&Girard-Perregaux_101. I think everything is in-tact, though I am not 100% certain as I'm not a professional watchmaker, though I have no reason to believe any parts are missing. I am wondering whether this may be something I can fix myself fairly easily, perhaps by simply tightening a screw, or if this is something that will require more work by a professional watchmaker. If this is a relatively easy fix what specifically should I do myself to fix the watch or, alternatively, what must I instruct a watchmaker to do for this watch? If this does require being taken-in to a shop, what will need to be done and what can I expect to pay or such a repair? As an aside, does anyone know what year this watch is from? What do the marks inside the caseback mean - I know these are service marks with dates but does this provide any additional information I can be made aware of as an amateur watch hobbyist? Finally, what is the approximate resale value of this watch if I can get it working again? Thanks in advance for your assistance!