My trivet question

[Neal Birkett]

How do you date trivets?

I have always though of trivets as Block era, perhaps extending into the small era.

I recently bought a DO and trivet that tends to support this.  The DO was a 9 Tite Top Baster, Slant logo.  The 207 trivet was distinctly different.  No Griswold marking, raised 207.  Thoughts?

thanks