SP.com "Arched" Notation Under Stamping?

[shanez]

Does anyone know what this means? It's in parentheses sometimes after the name, sometimes after the country, and sometimes both.

 

[coming to_falling too]

The stamp is arched.

 

[coming to_falling too]

See how Petersons is arched?

 

[shanez]

Makes sense. I can see how it might help identify when a particular pipe was made.

I was looking at some artisan pipes and just assumed they didn't really change their stamps much but after thinking about it I suppose even some do as much as some factories.

Thank you.

 

[coming to_falling too]

No problem, man.