Made in USA by Sylvania (1940s).
Muddy black plate. Bottom Pan-Getter.
Very nice tube. Sweet and balance sounding.

Nos in original box. Matched pair and quad are available.

Made in USA by Sylvania (1940s).
Special version of 2A3s made by Sylvania for U.S.Army.
Big brown base and smoke glass. Super rare and super long life.

Nos in original military paper box.

Made in USA by Western Electric 1994.
Curvilinear triangle mica on top.
Blue lable, black plate. O-Getter

Nos in original box.

The W.E. 300B is a vacuum tube with a long history of high performance and great sound. These tubes are new and in their original packaging. They were manufactured in Huntsville, Alabamba at the Western Electric plant. They are current production 2006 to 2008. 
Authentic Western Electric tubes - they do have 4 letters W - E - C - O on the bottom. As I know, that mean Western Electric Corporation. New in original box.

Made in USA by Arcturus.
Black plate. Bottom D-Getter.
Very good midrange detail and soundstage. Super tube.
Engrave base or orange print.
Nos but some no original box. Tested matched pair are available.

Made in USA by Arcturus.
Muddy black plate. Bottom Pan-Getter. 
One of the first and super rare version of 45s family from USA with smoke glass.
Very good bandwidth, bass, midrange detail and soundstage. Super tube.
Nos in original box. Tested matched (less than 1.5%)

Made in USA by Arcturus.
Blue balloon type with Ribbed black plate. Bottom Pan-Getter. 
Super rare tube. One of top-five list of most wanted 45s tubes in the world.
Very good bandwidth, bass, midrange detail and soundstage. Super tube.
Nos in original box. Tested very strong.

Made in USA by Arcturus.
Early version of blue tube from Arcturus with Ribbed black plate. Bottom Cup-Getter. 
Super rare tube. One of top-five list of most wanted 45s tubes in the world.
Very good bandwidth, bass, midrange detail and soundstage. Super tube.
Used. Tested very strong.

Made in USA by Arcturus.
Early version of blue tube from Arcturus. Bottom Cup-Getter. 
Super rare tube. One of top-five list of most wanted 45s tubes in the world.
Very good bandwidth, bass, midrange detail and soundstage. Super tube.
Used. Tested very strong as new.

Made in USA.
The premium of 45 in balloon type.
Engrave base, black plate. Bottom Cup-Getter.
Super rare version. 
Nos but no box. Matched pair are available.