I spent a couple of days on + off tracing this obscure oddity (and severely twisting my melon!) from pics posted by Nick on the freestompboxes forum, based on the suggestion from EW that it's "FZ-1-ish". I don't think it's 100% right, but this is what I've got so far - any comments?
The topology is basically the first two transistors of FZ-1, accommodating the positions of the resistors on the weirdly laid out board.

this one, quite rare:

Seems it was originally V87, and was renumbered V816, but it's a diff circuit to the chrome-y US-built V816 (which also doesn't have a hyphen in the name, grammar fans).