Also does the same bar fetch similar price if it is tarnished? What about Johnson Matthey bars?

Thank you.

I have just bought this coin for about $50 over spot. what do you guys think? Will it have a premium if sold in the near future or after few years, will it at least fetch the spot price easily. There is no marking of gold purity on the coin itself but it comes with certificate etc. Thanks
<a href="http://www.perthmint.com.au/catalogue/sir-edmund-hillary-1919-2008-1-4oz-gold-proof-coin.aspx” target=”_blank”>http://www.perthmint.com.au/catalogu…roof-coin.aspx