Marshall 50 Master volume with tropical fish cap?

[01redcobra]

Got this Mashall in that had been modified and the owner wanted it returned to stock. I found this tropical fish capacitor on the presence control and wondered if it was original? Also wondering what the value is? Thanks
link: http://i295.photobucket.com/albums/m...a/IMG_0656.jpg

[dai h.]

brn-blk-yel = 104 = 0.1uF

some marshalls had tropical fish, so considering that and what the condition looks like(plus a "correct" value), I would say it could be stock