Keepsake

The handwritten love letter serves as a keepsake of our relationship.

He gave his girlfriend a keepsake as a token of his affection.

The faded love letter was a treasured keepsake from their first date.

She keeps a small dried flower as a keepsake from their first date.

She kept a dried flower as a keepsake from their first date.

She treasures the handwritten love letter as a keepsake of their long-distance relationship.