1. Denmark 1 ore 1966: EF 20¢, Unc $1.50. Zinc is a terrible metal to make coins out of, it discolours easily and corrodes readily. High-grade examples can be hard to find. Denmark was just about the only country to continue to issue zinc coins once WWII was over.
2. Netherlands 1 cent 1953: VF 20¢, EF $2.
3. Australia $2 1989: well, around here they're worth $2. Krause says $4.25 in Unc, no other value given. AU$2 is worth around US$1.58 face value. You can see the "HH" designer's initials on the poor aboriginal fellow's armpit. Following complaints from the indigenous community about this apparent "branding", the HH was removed after 1989 - a minor die change not yet noted in Krause.
4. Mexican 1 onza: unless it's BU (and I think I see a fingerprint there), it's bullion only.
5. Bullion only, I'd suspect. Silver price currently US$12.81/ounce.
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