This is the inventor of the saxophone's son.
There are a couple of websites out there that have attempted to track Antoine-Joseph and Adolphe-Edouard Sax instruments. The problems with them are a) they're missing quite a few saxophones and b) they generally don't have pictures. I, therefore, proposed to start a project to update the lists. I never really got around to it, but I thought it'd be a nice diversion for now.

Date of manufacture is either determined from source material at http://homepages.ed.ac.uk/am/gdsl.html (archived HERE) or through http://perso.club-internet.fr/cjsax/series/adolphe.htm (archived HERE).

In 1928, Selmer purchased the Adolphe Sax plant. The first bit of these horns were made with Adolphe Sax parts and look like a horn from Adolphe Edouard Sax. The remainder of the horns looked like a Selmer Super Series horn. Additionally, I'm fairly sure that I have a pic of one with the "Cigar Cutter" octave mechanism.

These horns are generally valued as much as a Selmer Super Series horn, too, but they were initially sold at a lower price than a "true" Selmer Super Series horn.

A lot of these horns have two serial numbers. One is generally a low number and might be the Xth horn from the Adolphe Sax plant after the Selmer buyout. The other is generally a higher number and probably correlates to the Selmer pro-model saxophone serial number charts.
Here are a few offsite horns that you should take a look at:

sn 15352 silver plate Bb soprano at collections.nmmusd.org

Here's a list of *most* of the known A. Sax saxophones still extant, with links, info and pics. There are a couple of websites out there that have attempted to track Antoine-Joseph and Adolphe-Edouard Sax instruments. The problems with them are a) they're missing quite a few saxophones and b) they generally don't have pictures. I, therefore, proposed to start a project to update the lists.

Date of manufacture is either determined from source material at http://homepages.ed.ac.uk/am/gdsl.html (archived HERE), through http://perso.club-internet.fr/cjsax/series/adolphe.htm (archived HERE) or from the website they came from. I'm also trying to track the LOCATION engraved (e.g. "50 Rue St. Georges") and other "main" ENGRAVING, as this can accurately give you a date range your horn was made in, if all other engraving is missing or the horn doesn't have a date engraved.
1849 silver plate straight Bb soprano with gold plate keywork at MIMO
1867 brass straight Bb soprano at MIMO
1848 brass Eb alto at MIMO
1863 brass Eb alto at MIMO
1869 silver plate Eb alto with gold plate keywork at MIMO
1857 silver plated Bb tenor at MIMO
1868 brass Bb tenor at MIMO
1858 silver plate Eb baritone at MIMO
1861 brass Eb baritone at MIMO
1867 brass Eb baritone at MIMO
1858 brass Bb soprano at collections.nmmusd.org
1862 silver plate Bb soprano at collections.nmmusd.org
1868 brass Bb soprano at collections.nmmusd.org
1857 brass Eb alto at collections.nmmusd.org
1860 gold plate Eb alto at collections.nmmusd.org
1861 brass Bb tenor at collections.nmmusd.org
1872 brass Bb tenor at collections.nmmusd.org
1858 brass Eb baritone at collections.nmmusd.org
1878 brass Eb baritone at collections.nmmusd.org
1877 silver plate Bb bass at collections.nmmusd.org

General or Make & Model Information Other Picture Galleries Modern Website(s) Luthier Vents Luthier Vents Antoine Courtois Paris

See also ...
Saxpics.com
DoctorSax

Beaugnier is far better known for making horns for other folks. That's primarily Leblanc, under the Vito and Noblet names.