1953 one shilling English shield with ‘BRITT:OMN’ obverse inquiry

First time posting so hopefully it all goes well.

details on coin:

composition/copper-nickel

weight/5.66 g

diameter/23.5 mm 

thickness/1.7 mm

I have a plastic case of the 1953 coinage for the coronation and I think I have the obverse 1 variety of it but the coin still has the ’M.C’ that is reportedly present only on the obverse 2 variety as far as I know. I’m curious if there’s another variety or is this a error of some sort, or maybe somebody had forged it for god knows what.

The little coloured dots on the three next pictures correspond with the coloured boxes.

 It is obverse 1 

All three coloured boxes match. 

But the M.C? Just below the portrait it is there and it is only present on the second variation 

 Must be a new variety then. 

Obverse 3: As obverse 1, without M.C. 

 Will wait for other members to reply. 

The two letters under the bust truncation are the designer's initials, so M.G., not M.C.

Thank you for the correction, but it still doesn’t explain why obverse 1, which is reported to have no Initials under the bust, has the initials? 

radrick007

The two letters under the bust truncation are the designer's initials, so M.G., not M.C.

N#7183 

@Sjoelund Can you change MC to MG [Mary Gillick] on the graphic? Thanks