Square wooden mold

This is bizarre, again!!!!!

It is a very old wooden mold that I just found within Rock's things.

It is very, very old.

What is it???!!!!  If you know let me know by emailing me or writing to me on my site.

Measures:  20.5"" x 20.5" x 5.5"

Weights:  22 lbs

COMES WITH A CERTIFICATE OF AUTHENTICITY AND A LIFETIME GUARANTEE OF AUTHENTICITY.