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CGS update their valuations annually. The values are for a particular variety of coin in a particular grade, rather than for individual examples. Valuations by grade (and by year) can be found in their 'Valuations by grade' section. The values assigned to a particular coin thus simply reflect the variety and the grade, and are automatically updated. Here are comparisons of 2011 and 2016 valuations for some Viccy florins: I don't know of a way to find out exactly when a coin was graded, but they have been going 9 1/2 years and have graded about 40,000 coins, so you can take a stab at it. Each coin has a sequential UIN, so a guess at a coin with UIN 30000 would be some time in 2013

Why do you worry about CGS valuation? No one takes their valuations seriously including LCA.

Just taken (hopefully better) pics of my recent 1902 proof crown acquisition

Interesting that people always highlight what they consider to be OTT valuations, yet never raise the subject of the undervalued ones. There are significant numbers of coins with a super-low valuation. Certainly a lot that I would happily buy at the quoted prices if they were ever to become available. However, by definition there must be reasonable numbers of the slabbed ones circulating for them to be slabbed in the first place - so maybe your cynicism is justified.

I think it's uncollectable.

Happy belated Birthday.

Die crack shown in last photo.