It’s a Westbury, but I can’t tell you what model.
EDIT: I found a Facebook owners club and a quick look through that reveals that this is a Series 200 (W206). Probably Japanese made at the Matsumoko factory.
Link to the Facebook Group https://www.facebook.com/groups/58952112896?locale=en_GB
Given they've reacquired a stash of specifications and other docs from the early 30's through to 1969, I'm expecting a heavy release of re-issue vintage amps with tenuous claims of relevance to 50's and 60's pop music.