Vintage Thank You Stationary, Ivory Parchment, Roses Hortense B Hewett Set (EP-A140)
 
Here is a pack of "Thank You" cards featuring a floral design and a stack of matching envelopes.
The card has a cream or off-white base with a gold-colored "Thank You" in a script font. It is adorned with a floral border featuring pink roses and lavender-colored flowers in the bottom left corner, framed by a delicate red outline. The edges of the card appear to have a deckled or torn finish. The paper is a parchment texture.
It comes with a pack of plain envelopes. 
Approximately 40. I didn't count them but it appears to be mostly the full pack.