'Undating' commemoratives: STOP!!!

It looks like someone is actively 'undating' commemorative coins, so that they get date "ND" or "Unknown". The actual mint date gets hidden somewhere between brackets in the coin description.

Check out Austria, United Kingdom or Soviet Union, and order by date. You'll find a bunch of commemoratives which have no date. For some of them I know quite surely that they were properly dated earlier.

I don't get the rationale behind this. It makes coins difficult to find in the catalogue or in the search tool and pulls them out of the time frame in which they originated. There is no problem dating these coins, even if there are two or three dates on the coin: it's always the latest year!

Can we reverse this?

Examples:
https://en.numista.com/catalogue/pieces6637.html should be 1973
https://en.numista.com/catalogue/pieces5982.html should be 1972
https://en.numista.com/catalogue/pieces6034.html should be 1967 (pretty awkward, since the other coins from the same series can still be found with date 1967)

I completely agree with you.

Quote: SmartOneKgI completely agree with you.

That goes for me as well

+1

ND (yyyy) should really be reserved for cases when a coin was minted for a few years but there is no year on it, like some Monaco coins, for example.

https://en.numista.com/catalogue/pieces6637.html has a date transcription error for the obverse as well:

The dates should read
1873 + 1943 . 1973

Quote: johnh742https://en.numista.com/catalogue/pieces6637.html has a date transcription error for the obverse as well:

The dates should read
1873 + 1943 . 1973

  Corrected - thanks - and welcome to the site.