Your in luck for info, plus i will have pics up in awhile,
I just recently(about 2 months ago) purchased a 1964 silvertone "twin-twelve", 1484 model.
These amps are very raw sounding on the distortion/overdrive side, but personally that is the kind of tone that i like from an amp, raw and gritty.
The cleans on this amp amazing for the money i paid for this amp(i paid 200$ canadian for it by the way, so they CAN be had relatively cheap).
There is a couple things about these amps you have to watch out for, first off if you hear a buzzing sound when it is turned on, switch the ground switch, do NOT touch the metal on the amp if it is buzzing, you'll get a nice shock, another thing to watch out for is the tolex stuff(covering) on the outsides of these amps, they are extremely weak, not soo much in construction, just what they are made out of.
MY overall impressions of this particular silvertone amp, is that it is a great amp as far as im concerned, plus as far as i have seen they can be had for quite cheap.
SOUND:
To go more in depth on the sound of this amps, i have heard people describe the sound as "swampy", not in a muddy non clear sound, the amp has plenty of clarity, just raw like i said above, another thing is these amps are notorious for amazing tremolo effect and incredibly terrible reverb, neither of those things are an understatement, the tremolo is absolutlely amazing and the reverb is well.... to be blunt, USELESS!.
Again to the cleans, the guy i bought this from said the cleans sounded good, as far as i concernced that IS an understatement, this amp has a very glassy clean tone.
As far as versatility goes, it isn't excelling there, the volume knob is your only gain control, it breaks up sorta of a clean/overdrive around 4.
for all my classic rock/blues stuff i play it anywheres between 5 and 7 for a nice classic sounding overdrive.
for heavier stuff(ex: black sabbath, etc...) i use anwheres from 8 to 10, when you crank this amp it reminds me of the first sabbath album alot.
There is only a 2 band eq for each channel, bass and treble, i usely keep the treble cranked and the bass around 6, but thats just my settings.