Lukasz, ok, I see, indeed this designation is not there.
I briefly looked through some of the posts on 280Sl cylinder heads designation discussions but have not spotted SE designation. But again, I looked just briefly. You may want to look at it more thoroughly than I did with the use of search function, before others answer.
The logic applied to these designations is a bit of a mystery, especially that the casting numbers, in your case 130 016 1101, are not part numbers, so we cannot track where those heads were installed.
I hop someone chimes in to help.