Another MkII*** Unit marking question...

[Gpcooke]

although I haven't received it yet, I am expecting a very nice Ross MkII*** with only two unit marks, as well as the US acquisition stamp. One one of the two is fairly visible in the photo provided by the seller. I have not been able to find any guide on line for deciphering and am wondering if anyone here can help. It appears to be G (or 6) FCCE over 10. Thanks for taking a look. Here is the mark:

Attachment 80801

Information

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[Gpcooke]

Sorry this is a double post. I wasn't sure the pic had posted the first time.