Help identifying bezel insert

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Evening everyone. I Would appreciate help identifying year and Mk_?_ of insert. Please let me know your thoughts. Thanks.
 
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MK3 Fat Font insert. Chronologically after the long 5 MK2 insert from the 60's.
 
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Mk 3, looks to be in nice shape. Have a shot of the back by chance?

Thanks. I just put it on my watch and didn’t take a photo of the back. The back is a shade or two darker and blueish-dark charcoal grey.
 
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Thanks. I just put it on my watch and didn’t take a photo of the back. The back is a shade or two darker and blueish-dark charcoal grey.

Sorry forgot to answer other question—I’d say very late 60’s to mid 70’s.