Okay, so the movement will be the 6479.
If you're up to do this... open the caseback...
You'll see this:
IF YOUR CROWN CAN SLIDE INTO YOUR MOVEMENT RIGHT NOW>>> DO NOT UNSCREW THe SCREW FURthER>>>> SKIP STEP 2
I have circled the screw in red.
What this screw normally does it it essentially locks the crown in the keyless works so that you can wind in first position and time set in second.
What has most likely happened in your situation is that this screw has gotten loose.
So.. since you have already pulled out the crown.. Follow these directions...
1. Get a screwdriver that will fit into the screw. This could involve grinding down a regular precision screwdriver so it is sharp enough to fit in the screw. You can also use an exacto knife, but be very careful.
2. Turn the screw COUNTERCLOCKWISE only about 1/4 a turn and attempt to put the crown/stem back in. If it does not slide in... turn in additional 1/8th turns.. until it goes in. DO NOT OVERTURN. if you overturn.. you're fu*ked. (normally from a fully tight screw, 2 full rotations of unscrewing, will result in sh*t hitting the ceiling. its very scraight forward if you just be careful not to overturn)
3. Once your stem is in your watch, screw that screw back in CLOCKWISE until it is tight.
4. Wha-la. Eazy peazy.