Firstly a warm welcome to the forum.
Secondly, whilst I have driver 2-3 Terriers, I do not claim to know anything about the mechanicals of them.
The ones I drove had a "normal" truck type handbrake lever.
I would say, looking at the attached piccygraphs, that the front bumper is not an original. Indeed, it might not even be from a Terrier. Compare it with this
http://www.truckandbusforum.com/gall...date=lastvisit
Also, I don't recall seeing that type of indicator fitted to Terriers, here, in the UK. The sidelights are similar to those that we have seen, of trucks on Malta.
Lastly, and this is only my impression, this might be an early model. Notice the difference, unser the windscreen, compared with mine.