The front sight looks like a generic unit, unlike the rear sight, as fitted to many german guns.
If you can measure the dovetails I'll have a look to see if I have anything, and whether it's the same as an HW unit. It appears to be having looked on the
Anschutz website for the 1981 and 1993 versions.
The gamo unit as used on the S200, is ok but I wouldn't recommend one for a general use gun. I have one and the build quality is cheap/average, it doesn't feel robust and the rear aperture is rather small for anything other that paper punching.
The other option is a Williams receiver sight. Again I've have one with a blade (regular notch) for a project that didn't happen. Well made, low profile and can be adjusted to fit all airgun dovetails. It's on p.10 of the Williams Catalogue,
here. I can take some photos on an HW if that appeals.