Inquiry: Has Anybody Seen 1980 Isle of Man (Silver) Viking on Horseback 5 Pounds (KM-29a)

This is a coin I have on and off wondered about for some years and is listed as essentially an "ordinary" NCLT crown in the IOM series. It is the same design as the gold coins that were issued 1973-1983 in 1/2 sovereign, sovereign, 2 sovereign and 5 sovereign sizes but is a silver crown, light in weight at 23.84 gm and diameter of 36.1 mm.
The coin is designated as KM-29a, and may be simply a pattern as many sources do not list it. But many also do not list the 1983 gold Viking on horseback either (this is the sovereign size):

 

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That was so nice a portrait of the Queen.

 

I so agree; too bad we couldn't have kept a "Young Head" version of QE II for 60+ years....

 

I haven't seen one, though in the last few years I have a few more obscure modern world gold pieces for sale so one may turn up.
Is there any listed mintage?

 

Yes, we are on the lookout for these gold and other pieces (I posted on my 1983 IOM Viking proofs here before). No mintage listed in Krause (and with a value pegged at 45 USD!).