Australian 2 oz silver kookaburra with gold privy insert

Can someone help me here? As i understand it this coin issued by The Perth Mint has 99.99% silver and according to weight specifications at least a half a gram of 'pure gold' privy insert in it.
At current price for Bullion content alone 2 oz of silver and a half gram of gold, the bullion content alone is $70 (Gold $25) so these coins on Ebay with starting bids at 99c look good long term collection value. Certificate of authenticity says only 1500 minted Worldwide for each coin making them RARE too.
i would appreciate any comments from 'learned' numismatists on their thoughts as to long term appreciation.
i recently purchased the 1994 set of 4 X 2 oz Kookaburras and got them for $90.00 Australian (which i thought cheap, but some $80 odd right now) and they are beautiful to behold.
Will they go up if silver goes to $30 or $40?? Should i buy more now???

 

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Half a gram is, what, 0.017 oz of gold? Seems a bit more than I would expect for a tiny gold inlay like that.

A lot of the Australian Kooks sell for multiples of their bullion value. The scarcity of these seems like they'd be a decent buy at that price.

 

My mate weighed the standard 2 ounce and silver kooka 99.999% silver and difference is half a gram . Privy insert is a replica in miniature of coins issued from history ..cheers John

 

have also contacted The Perth Mint for coin specifications on Perth Mint issued 2 oz Kookaburras with Gold Privy inserts...

 

There is one kooka Gold Privy coin on sale now on Ebay that i know only 100 coins are issued wwide outside of sets to listed collectors who will not putem on mkt ..think about it.

 

found this data from Bullion Supermarket on 2 oz kookaburras but does not refer to the half gram of gold
Silver Kookaburra Technical Specifications

SizeFace
Value
AU$Fineness
/1.000Silver
Content
(T oz)Gross
Weight
(g)
Diameter
(mm)
Thick
(mm)
1 Kilo$30.99932.151001.00210114.6
10 oz$10.99910.00311.34775.508.7
2 oz$2.9992.0062.7753.304.5
1 oz$1.9991.0031.13540.604.0