Roost SR20 - RARE Vintage British Amp Head

Roost SR20 50w amp head
An ultra-rare example of British Hiwattish/Sound Cityesque greatness. 
I believe that this amp was born in the mid-'70s. It is definitely an earlier Roost, as evidenced by the model name (It was changed to SR50 later on), Partridge Transformers (later Roosts did not use Partridge), and metal switches (plastic on later models). 
Features: 
50 watts
4 inputs (Normal High/Normal Low, Bright High/Bright Low)
4ohm/8ohm/16ohm impedance selector
Voltage selector
Bright switch and mid-boost switch
Functional condition is excellent. My tech gave the amp a check-up and declared it healthy, requiring only a biasing of the power tubes (a pair of Winged C EL-34s are in there). At my request, he changed the value of the "Bright Cap" to tame the bright inputs, which were insanely trebly. 
Cosmetic condition is fair. Plenty of scuffs and scratches, and the rear plate has a weird bubbling thing happening. There are two mystery holes (covered by electrical tape) in the rear panel; an effects loop that was added and removed at some point is my guess.  
Not original to the amp are the cap mod, replaced 3-prong power cord, tubes, tand the aforementioned rear panel mystery holes. 
Overall: it's a killer amp, and has served me well, with no issues whatsoever. It's a great choice if you wish the Sound City MKIVs amps had passive tone stacks rather than active, and/or can't afford a vintage Hiwatt or Marshall Plexi. Selling because I am searching for a 100w Roost. I play in one of those overpowered/undertuned bands, and would like 4 EL34s under the hood. 

If you are Roost-curious, this forum is a great resource for things Roost:

Buyers outside of the USA: I will consider shipping internationally if buyer pays for any shipping cost over $50. Please contact me to discuss before buying, to make sure that I can ship an item of this size to your country. 

Trades considered: 
Roost SR22
Marshall 1959XL Plexi or JCM800 2203X reissue 
Gallien-Krueger 800RB
Traynor TS200, TS100, TS120 
Montreal Assembly Count to 5
Stomp Under Foot pedals
Smallsound/Bigsound Buzzz, Year 4545, TAFM
Fender American Standard Tele, Blacktop Tele, Standard Tele HH, Blacktop Baritone
Squier Bass VI or Baritone Jazzmaster 
Puresalem Reverberation