Vintage Arts & Crafts Copper Ashtray with Match Holder ID?

I have this copper Arts & Crafts ashtray.
Marked on the bottom as pictured.
Can anyone ID the maker's mark?
Appears to be etched with the date 4/21 also

Thank You

 

Attributed to Heintz here....

http://www.heintzcollector.com/tobacco/PipeKnocker2565A.htm

 

FWIW, I don't necessarily disagree with the attribution but don't find it to be definitive. I can find no other examples of your piece. Neither can I find this exact configuration of matchbox holder or flower pattern among Heintz's products.

 

Thanks for the info. It's more than I had a few minutes ago! We'll see what others possibly have to say.

 

verybrad;
I did some more research based on what you had, and yes, it is Heintz! The sterling over copper or bronze is common with Heintz, and I found another Heintz piece that had the same 'four leaf clover' (almost) mark along with the Heintz logo.

 

Under the link Brad posted they called this a "pipe knocker." A new term, to me. I love to learn things here.