Advice please TITAN rifle identification

[mel h]

Hi there, being a long term collector of early guns and old springers I never had much interest in PCP, which leave me a little lacking in knowledge of them.
I got involved in a bit of a trade with a pre war BSA through a friend, with someone who was offering a nice Weihrauch in p /ex. Today I got to see the Rifle and could see that it was not any Weihrauch that I'd ever seen, it's clearly in nice condition, a good quality Walnut stocked, single pump PCP, with little in the way of identifying marks other than an almost invisible sticker with the name TRITON. I assume that it's an example of the rifles designed by John Bowkett but having looked at some photo's online am still not sure which model it is.
Any help will be appreciated as I'm in a position of having to let him know soon. I quite like the look of it and feel as if I should take it.

Another thing, It has only a telescopic sight, did they come with any open sights when new?

https://ibb.co/album/nzFjVa