I was pointed in the direction of this forum by some good folks over on Reddit. I have come into the possession of what seems to be a PAL release of Star Strike by Telegames. I have not been able to get much information about it, other than a few mentions, and its appearance in a few databases. http://www.atarimania.com/game-atari-2600-vcs-star-strike_7809.html and http://www.completeroms.com/dl/atari-2600/star-strike-telegames-pal-/1760
I've been provided with a little more information about Telegames and how they came to license the game, but putting a value on it has proven very difficult. There are no eBay listings that I have been able to find, let alone a finished auction. I am aware this game -even though, perhaps rare - might not necessarily be that valuable. I'm not an Atari collector, my preference lies with the PC and PS1/2 consoles for now, so this game would probably be part of a trade in the future.
https://imgur.com/a/1XhNZel
Thanks for your time.