I'm not a stamp collector so for fear of misusing a term I won't get all philatelic about it, but here's what I can tell you.

I am the original owner of this sheet. I bought it at the post office in 1997.

Since then they've been stored flat. They've never been in an album.

They've been in a smoke-free and pet-free home the whole time.

They're still in the vintage wax paper bag they came in.

The upper left corner of the card has a slight bend which doesn't reach the stamp in the corner.  The sheet is in great condition and looks like the day I bought it.

Will ship via Ebay standard envelope