I'm interested in documenting different markings on the exterior CC turn-lock closures through time. I know alot of Chanels have no marking on the CC's and that some have a small square-shaped indentation on the upper area of the left C. I was hoping others could chime in with any other markings Chanel has definitely used over time and hopefully post pictures for everyone's reference. I know there are some vintage Chanel lovers out there that might be able to help. Thanks so much, and I hope this proves to be interesting and helpful to others as well!