Vintage Valentine POP UP Embossed Late 19th or Early 20th Century German

Vintage Ephemra LATE 19TH OR EARLY 20TH CENTURY VALENTINE, PROBABLY GERMAN. VALENTINE GREETING TO MY SWEETHEART "LOVE'S GREETING" Pops up for 3D look, could be missing a mechanical piece that fits in the slot at the bottom. Bottom piece is detached. No writing.