Marshall JCM 900 emblem measurements

I have been asked to create a parody replica logo for the front of a Marshall JCM 900, but don't know the measurements of the old emblem. I have some questions I ideally need answered, and would be very grateful if some JCM owners out there would spare two minutes to get a ruler out.

I need to know:

The rough size of the front emblem - width and height.

The spacing between the two screw holes, if they are horizontally level, and if they are equally spaced from the centre of the amp head.

The rough screw size - what size the screw holes should be, and rough amount of countersink.

Thanks in advance.