Identity of crystal stemware mark

[redvetlady]

I have four Bohemian cut to clear crystal wine glasses, each a different color.  Each also has etched onto the base a stemware mark that I have not been able to identify.  Does anyone recognize this mark?  If so, I would very much appreciate knowing more about it.

[pjandike]

Nachtmann?

[kaudet4gx3]

According to this, it has the Beyer acid etched crown & B mark.

https://www.worthpoint.com/worthopedia/different-beyer-crystal-cut-clear-1828161120

[kaudet4gx3]

This person thinks it is a Bayel mark.

https://www.worthpoint.com/worthopedia/bayel-vineyard-grape-wine-glass-hock-1810558526

[janetpjohn_la]

Here's a paper label: https://www.pinterest.com/pin/574701602419562990/?lp=true
Janet