Earlier tonight I tried to find the source of a vibration noise on my Collings MT. I removed the truss rod cover to check to see if it was loose (it wasn't). I did notice the #1169 on the back of the truss rod cover as well as in the truss rod pocket. Is this the serial #?
I didn't see a # inside the f-holes. The source of noise ended up being a loose button screw. Some time ago I noticed one screw missing, although the button seems to be holding on okay.