Sellers are not ticking the boxes identifying their item as "Original" or "Reproduction
And sellers scream when eBay tries to make them use Item Specifics.
Then again when eBay removes some Item Specifics.
Many categories do have date ranges for the products, and most have an option to add other information to listings.
Plus sellers can put anything they feel would be useful and attractive in Descriptions.
I agree it does make things more difficult.
The best I can think of is to only choose "original" even though there will be a lot of reproductions mixed in from ignorance or malfeasance.
And try to believe the journey is the better part.