Suicide Murder? Prince Rudolf of Austria & Baroness Mary Vetsera Rare Royalty autographed "For Minnie"

"For Minnie"

but I own another 1/4 daguerreotype from the same sitting that has the date

But as far as provenance

Accompanying the image is a note written in what I think is German

Suicide Murder? Prince Rudolf of Austria & Baroness Mary Vetsera Rare Royalty autographed "For Minnie"TWO original cabinet card photos, Crown Prince Rudolf of Austria in uniform and Baroness Mary Vetsera, his mistress. The couple were found dead in an apparent murder suicide, at his hunting lodge, Mayerling, in 1889, however many believe that they were actually murdered. Both cabinet cards are 6. 5" x 4. 25". Rudolf's photo has light edge wear and a missing chip in the lower left corner; Mary's photo is in good to very good antique condition, light