This is a VERY complex subject! The sight you have is certainly correct for the 'family' of 10.5cm guns it appears you have been looking for. The question is what exact type? Naval, Flak or Field? I'll leave that to you, it'll take careful reading of all the information on the sight and cross referencing to tie it down.
Here's a couple of linky things to get you started:
Axis History Forum • need info U-Boat Desk Gun
Axis History Forum • Id. naval guns
You may well have to go further from there.
Good luck, Ned.
Last edited by big ned; 03-14-2013 at 02:31 PM.
'I do not think we can hope for any better thing now.
We shall stick it out to the end, but we are getting weaker of course, and the end cannot be far.
It seems a pity, but I do not think I can write more. R. SCOTT.
Last Entry - For God's sake look after our people.'
In memory of Capt. Robert Falcon Scott, Edward Wilson, Henry Bowers, Lawrence Oates and Edgar Evans. South Pole Expedition, 30th March 1912.
thanks ned ive posted it on that forum,the little corrosion looks like caused by salt air