Listed in the Krause catalogue (KM#27) as mintage 30,000 (you see on the certificate the 50,000 is the "limit of issue" - they didn't actually make that many), CV US$150 - which was not much above melt when the catalogue was printed.
The trouble with Isle of Man coins is that there's just too much of it - hardly anybody seriously collects it because they just can't keep up with the vast amount of issues. IOM takes up over 70 pages in the Krause catalogue - and most of the types aren't even pictured.
Zero demand = no collector's premium = the coin is only worth bullion. It's still gold, though. Gold is good.

Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis