Most government issued coins are the go.
I think the only real thing to consider is liquidity and how close to spot you can buy them for. If you're selling back to a dealer, you don't really have to worry too much about what coins or bars you buy - they'll usually pay you a % below spot regardless of what coin or bar it is...
There's more to consider when selling to the private Market. Choosing a recognisable coin with high demand is preferable. Things like:
Canadian maples
Krugerrands
Britannias
Eagles (silly premiums at the moment)
Are all very liquid....
With Australian coins, almost all Perth Mint products are highly liquid when sold as a bullion coin, rather than a collector series coin.
Roos
Nuggets
Lunars
Etc
There seems to be a cult following with lunars and maples. These would be my pick.
Just don't get caught up paying high premiums and expecting to get it back when you sell. keep a sharp eye on current spot price and premiums. Right now, 1oz coins have roughly a $100 premium. E.g spot price $2500 - 1oz coin price $2600. Any coins listed about at, or below that $100 premium is worth your consideration.
Smaller denominations command higher premiums:
The 1/2 Oz coins are going for $1350.
Or $2700 per Oz.
The 1/4 Oz's are going for $700
Or $2800 per Oz
1/10 ozs are going for $300
Or $3000 per Oz.
If you can get any smaller sizes at the same equivalent premium as 1oz coins, I'd jump on that, too. But otherwise I typically stay away from them...
The one thing I don't like about sovereigns, is they require further explanation to new stackers. At the right price, they're very liquid amongst longstanding, familiar stackers and collectors, but won't be as liquid for the Newbies entering the space. If you're selling into a market saturated with New Members, sovereigns are not going to be as liquid as government issued coins.
