In addition, for decks that were printed over multiple years, but didn't update copyright date this was useful to list it as '1970-1976' for example.Replica/Facsimile decks can list BOTH the date when the copy was printed AND the date of the deck it is a copy of. This can be done in the format of '<original date> <copy date>'. For example, '1804 2004'. This should be reserved for exact or near replicas, not inspired by decks.
It seems the new system restricts to just 4 characters. However, at least it doesn't enforce type and allows for the 'x' designation. Please keep this:
On a related note, perhaps this is better corrected through adding a new feature instead. We previously kept a 'vintage' deck category and talked about adding a 'replica' one (although differences exist between a replica and facsimile and inspired by, but that's another finer point). Perhaps instead add a checkbox called 'Replica / Facsimile' that can be selected as needed and when selected a new 'original deck date' field appears. Then, have a view/filter called 'vintage decks' that will show all decks 20 years or older by selecting for when date OR original deck date is older than 20 years.* If the exact year is not known, common for vintage decks, substitute 'X' as needed. For example, a deck known to be printed sometime in the 1960s could be listed as '196X'.
EDIT - this should be available for entire database view/search and within a person's collection.