I am trying to identify the M number on this insulator. Any help would be needed. This is a Kathy Geaves mini multi-part and it is 2 1/2" tall and 3 1/4" wide at the upper shell. I am trying to identify what M number it was modeled after.

It has been identified by Steve Lohr as close to a M-3071 but the crown is different.

Thanks Steve.