old green glass bowl

I've had this bowl a long time and just wanted to find out about it. It's decorated with three cut ships and squiggle lines. Bubbles and inclusions are in the glass. Ground (but not polished) bottom. 10.5" diameter and 4" tall. Thanks

 

Any thoughts?

 

There are a couple of different pieces with the same ships and zigzag on worthpoint, but no ID. https://www.worthpoint.com/worthopedia/18th-century-blown-steigel-type-flip-2015777599

 

Thanks much. That gives me some search terms.