The is one single piece as you are able to distinguish in View 1
There is also a Doorstop version of this Bookend,
Hubley Design # 487 -- 11" long by 7" Tall
The doorstop version is 2 pieces held together with 2 screws
going thru one half threading into the other half.
The screw heads are filled and painted over.
The doorstop version is shown on this site under
"Dogs by Hubley"
This bookend is documented is Ron Rittenhouse's
"Catalog Pages of Hubley"