FS: AA-Battery Pack FG

For sale I have this battery pack FG for the old film Pentax cameras, which I no longer use. Years ago I used it with my MZ-50 body, which no longer works and I'll keep it for sentimental reasons, but the battery pack is still working and it might be useful to someone with a Pentax SLR. According to the English manual, it is compatible with Pentax MZ-5/ZX-5, MZ-10/ZX-10 and MZ-50/ZX-50, although the Japanese text also seems to mention a MZ-3 model.
It's just a simple battery holder which enables you to run the camera on four AA batteries, instead of the CR2's. There are no buttons or switches on it. It can be mounted on a tripod.
I'd like to sell it for £15 plus shipping. Bear in mind that I'm shipping from Slovakia, and the shipping fees should be around £7.

Sold via another forum, thanks for looking.