No problem with the image quality; it tells me all I need to know.

Though I can't quite make out the brand name it is, as I suspected, a Chunghop.

Chunghop manufacture a TV range of remotes (e.g. TV-39; TV-301), but they also make the RM-139F...



However, as you can probably surmise from the image, the above (and the previously mentioned TV range) are actually produced for the Chinese market, and as such their instructions are in Chinese. The "English" model RM-139EX



though is a close enough equivalent to make no difference.

The codes both of these models use do not offer Grundig as a named brand so the only alternative is to carry out a manual search. If that fails to produce a result I'm afraid there is no code.