The Eb Baritone.
Interesting fact: the oldest surviving saxophone
is an Eb baritone made between 1843 and 1846.
* Curved or "ophicleide shaped" (see the comments on the Pelisson "F baritone", above).
There has been a persistent rumor that the first A. Sax baritones were curved, as well. I have yet to see any pictures to substantiate this.
. These horns were not ever production models, as far as I'm aware, but all custom-makes.
* From low B to altissimo Eb. 1861 A. Sax baritone
. From saxpics.com, via Randy Emerick.
* From low Bb to altissimo Eb, F or F#. 1977 SML low Bb/altissimo F baritone.
From saxpics.com, via worldwidesax.com, via Steven Weinert.
* From low A to altissimo F or F#. 1953 Selmer Super (Balanced) Action low A/altissimo F baritone
. From saxpics.com, via saxquest.com.
The low A baritone may have first been produced by A. Sax, himself (based on the 1866 patent), but I know of no surviving examples. The first low A baritone is generally accepted to be the Selmer Super (Balanced) Action in approximately 1946.
Manufacturers: Not quite everyone. The baritone is a somewhat "unique" animal and a lot of companies concentrate on just alto and tenor production. Most large manufacturers, hover, do produce a baritone and most produce one with a low A key.
* Wikipedia Entry
* Video: Gerry Mulligan (Dave Brubeck on piano),Things Ain't What They Used to Be.
* Sounding range
, low Bb to altissimo F# horn.
* Weight is 11 lbs for a low A version (approximate). SOURCE