Read about this series of posts, regarding items in a box originally owned by Belle (Lamunion) Fellows Tinker here.
The cast of characters is located here.
This Christmas card must have been delivered in an envelope, the reverse side is blank. The signature appears to be from the Bauers. I can’t find any family with a name Bauer or other derivatives in the areas where the Fellows/Tinker family lived.
This one is a real mystery.