RE the centurions
I tend to agree with the width factor as "likely" helping to date some but as I mention, Tim Graham in the linked thread has had dozens apart, so I keep his findings and thoughts in mind.
If you look at my collection pictures, you may note the one to our right next to the urn pommel example has an nco blade and the one next to that on the right, a musician blade. The longer nco example Horstmann and the musician blade example Ames. Also note the narrower reeding on the grips of both the example with an urn pommel and the nco bladed one. The rest there are all Ames, the shorter blade examples on our left are likelyfrom the 1840s.
Whether the two spadroon bladed examples are far later made up of surplus, I may never know. I have found simple centurion pommel examples with a wide variety of blades, including the general officer "broadsword" blades of 1832/1833. The Horstmann with the urn pommel and foliate langets has been associated by some collectors and scholars with the German American Turnvereines/Turners. As that pommel was used pre ACW for the army engineers, I have to list the few I have encountered as plausible prewar. One thing I am fairly convinced of is the typical militia nco sword went to the 25" blade length and blades starting to narrow before the ACW (albeit the Ames examples seem to have maintained the width the longest).
A lot of private purchase existed before and after the ACW, so nothing really surprises me past the 1840s/1850s. Horstmann and Ames had huge stockpiles of parts to hilt on a whim.
A bit of text from Horace Greeley published in 1872 regarding Horstmann
"We examine a magazine of some thousands of blades, of forty or fifty different patterns and sizes, waiting to be set and finished; the rooms where the hilts are made, and the engraving, gilding, chasing, etc., executed; we wonder at the infinity of small fixtures used; we begin to count up the different pieces of a completed sword, and find that there are between thirty and forty in the sword and scabbard alone, "
Somewhere around page 790 or so
https://books.google.com/books?id=6UQaAAAAYAAJ
Google books rule!
Cheers
GC
Amongst other documents I have uploaded is an older book on Horstmann, little sword related but a good book
https://drive.google.com/file/d/0B9AOFMA8y3ODSXdOX0xNSlZFNm8/view?usp=sharing
Other documents on my drive are from the American Society of Arms Collectors. My mess as I see it
https://drive.google.com/folderview?id=0B9AOFMA8y3ODN2hkZzNEOURZY3M&usp=sharing
An archive of all the old ASoAC bulletins
https://web.archive.org/web/2011101...societyofarmscollectors.org/bulletinindex.htm
Cheers
GC