ID Manufacturer of these Nipples?

[B P Arn]

Any idea who made these stainless steel nipples?

 

[Hillbilly Delux]

Hot Shot® Nipples:
Crossed drilled through the cone to provide venting, reputed to
give better ignition when using Pyrodex® powder, hunters like the
ease of removing fired caps. Stainless steel tempered dark gray.

 

[Zonie]

They look like Uncle Mike's Hot Shot nipples to me.

 

[B P Arn]

Thank you, gentlemen.