Hand-wired boutique amp from Goodsell amps in the US. Sadly retired from amp building now, his amps are pretty hard to find in the UK, but over at the gear page they're well loved.
His flagship amp is the EL84-powered Super 17, and this is basically a 6V6-powered version of that amp.
Includes footswitch for the tremolo.
This from Mr Goodsell:
I didn’t know any of those had made it into UK. That amp is nearly identical to the early 17 MkIV series (identified by the mini-toggle mid switch) except that it features 6V6 power tubes rather than EL84s. It puts out about 15 watts and occupies a space somewhere between an AC15 and a Fender Deluxe. They were always held in high regard, especially for the tremolo.
Pickup from Leeds.