I have all four: Platinum, gold, silver, copper. And yup: Those are the ones I mean. Thanks for info. Odd, isn't it, that there are no serial #s or grading?
Anyway, on to the next question: How does one decide re the worthiness of certification? For example, I have a 10-coin set of late 1800s and early 1900s liberty $10 gold coins, and 20-21 equivalent $5 gold coins (attached, and including a $20 as well). In the context of selling it seems a bit odd NOT to certify them, but it's a pretty expensive process to do so. And that isn't even counting the multiple bulk sleeves of silver dollars--both Morgans and Eisenhowers--which are similarly uncertified.
What resources are people using to make these choices?