Recently we looked at a similar black metal pair of owl bookends with no maker mark. Now these Owl bookends are listed on Etsy that have a Made in Austria mark on the base. They are identical to the other black ones except for the color of the marble base.

The I Love Lucy Owl Bookends were Austrian and the same shape but had a darker marble and the owls were painted brown

See it on eBay
The Austrian owl bookends above are painted brown like the pair on I Love Lucy but they dont have a marble base. We know the color of the I Love Lucy ones from an original color on-set photo.