Any chance of getting a top view photo of both the front and back of the card, preferably without the warranty sticker.

If you got a vga card, you could install it together with the mda/cga? card if it is in mda mode. in dos you could then switch to it by using ' mode mono ' and ' mode co80 ' to get back to vga.
With the vga card in the computer you could at least find an idea about the jumpers for the printer port, I think you can set the io port, not sure though possibly 0x3BC, 0x378 and/or 0x278
I think the 5 pin header is for a light pen, though again, not sure.
Good luck.
edit: From a quick look at another card, I'm gonna say, leave all the jumpers off and then try it.
edit2: added the photo I found online. yes it's only 9 jumpers, but this one doesn't have an extra header, which I assume is for the light pen, and will probably have an enable/ disable jumper.

Thanks, yea I spotted that, tried as they were labelled and shifted left 1 or right 1
I hope these shots come up ok

Necroing this thread, but I found this exact card on eBay, where the seller is claiming to have tested it to work. Attaching an image where the 10 jumper block is clearly visible. Hopefully this will still be of some use to someone!

Yet another image from a different eBay auction, where it's being expressly sold as a Hercules card with no mention of CGA, also claimed to be tested working. Different jumper settings here.