Grandstand - Indiana Jones?

[cmt]

Whilst clearing out some old boxes I came across what I think is an 'Indiana Jones' handheld from Grandstand. There's no branding on it other than the 'Grandstand' logo, but it appears to match the picture on this site (http://www.handheldmuseum.com/Grandstand/IndianaJones.htm). It's unboxed, and I don't know if it still works yet - I've not got the batteries to test it.

I've not been able to find out much else about it - it's not in the FAQ and apart from the page on the museum site I can't find any other references. So is this rare, or am I just looking in the wrong place or under the wrong name?