That looks very much like an older ceramic safety capacitor. 2X today would be written as X2. That being "X-type, Ceramic Class 2". Their purpose is to minimize EMI/RFI interference - something that makes sense in an SG.

The X means that it is to go between the line-cord leads (hot and neutral). 2X means it will tolerate a peak voltage pulse of 2,500 while in operation.

More explanation he https://www.allaboutcircuits.com/tec...-y-capacitors/

Mouser-available Vishay-made device he https://www.mouser.com/datasheet/2/4...5r-1762222.pdf

Peter Wieck
Melrose Park, PA