Brake hose issue on R80ST

[gpwheels]

I purchased an R80ST which I have been doing some work on to get it road worthy.
The previous owner has replaced the original brake hose with a braided that goes from the master cylinder straight to the caliper.
It has now come to the point where I am re-assembling the front brake and the hose male thread fitting that goes into the master cylinder looks wrong to me. It has a concave end as does the master cylinder inside, but I thought it should be convex so the two mate together.

Am I right or wrong with my thinking?
Anyone looked at one of these hoses recently?

Picture of it here...
https://dl.dropboxusercontent.com/u/6211169/brakepipe_mcend.jpg

 

[Beemerboff]

By the look of it there has been some form of sealant on the threads, and it does look as if you should have a convex surface to seal against.
I can vaguely recall looking at a site a long time ago from a country which allowed home made lines and they had a good selection of ferrule raptors to cover almost any contingency.
Always assuming you are not trying to put the line on top top bottem, of course!