Some further googling has revealed some basic trademark information for the Explorer 12 range.
Sadly there is no pictured design included although further exploration of the trademark site might glean something [ a research opportunity there for someone!].
Its interesting how the registration date is in August 1987. This is also the date for an Explorer 12 launch event in London [see previous post on the Essex Record Office sound file]
The last known representative, Novagraaf, are an international intellectual property firm and are still in existence. I did write to them but not had a reply as yet.