the guitar jack on brian may red special

i was wondering what kind of guitar jack does brian may have on the red special. Is it mono or stereo
for this is not shown anywhere but i thought it would be a good idea to ask.

Mono my friend, It gets split later in the setup to use the Vox AC 30s in various ways

I saw on BM.com that he recently replaced the original jack from the Red Special. The old one should be put in the Rock & Roll Hall of Fame.