I think I understand your confusion based on the title of your thread "correct French Fusil Fin de Chase Type C". I'm not even sure which French gun your are asking about.
Kevin Gladysz in
The French Trade Gun in North America discusses the following guns in some detail:
- Hunting guns (fusils de chasse)
- Trade guns (fusils de traite)
- Guns with single and double anchor marks (fusils à l’ancre, fusils à double ancre)
- Fine and semi-fine guns (fusils fins, fusils demi-fins)
- Fancy and semi-fancy guns (fusils de façon, fusils demi-façon)
Gladysz used the names he found in period documents for each category of gun he discusses. He also has a chapter on "The Evolution of the French
Fusil 1699-1760" that discusses the changes in French gun decoration in stages:
- Stage One: Late Louis XIV or the Berain Style (1699-1708)
- Stage Two: Early Regency (1708-1730)
- Stage Three: Regency -- Rococo (1730-1740s)
- Stage Four: Rococo -- Louis XV (1740s-1760)
The implication I get from reading Gladysz is that the various fusils changed over time, at least in the style of sideplate, butt plate, and trigger guard.
T. M. Hamilton in
Colonial Frontier Guns describes four French guns:
- Type C trade gun (1680-1730)
- Type D trade gun (1730-1765)
- Tulle Hunting Gun (fusil de chasse)
- The Buccaneer
Hamilton based his Type classifications on gun parts that had been recovered from archeological sites.
Hamilton and Gladysz pretty much agree on what the
fusil de chasse and the
Buccaneer guns looked like. Hamilton did point out that there are as many complete
fusils de chasse in museums and private collection as there are individual archeological fragments, which he thought strange. He concludes that these guns were not widely traded to Indians, but meant for civilians and Indian partisans.
It is more difficult to correlate Hamilton's Types C and D guns with Gladysz's various
fusils.
Some modern suppliers of guns and kits have associated Hamilton's Type C with the
fusil fin because it has a fancier sideplate than the Type D. That doesn't fit with Gladysz's various stages of French gun evolution since the term
fusil fin is used in the period documents for most of the history of New France, and he does not associate the
fusil fin with any particular sideplate.
So which of Hamilton's or Gladysz's guns are you interested in seeing pictures of?
In answer to your question about rear sights, I don't see any rear sights on the pictures of the French guns in the books,
The French Trade Gun in North America or
Colonial Frontier Guns. This is probably because all French guns were smoothbore muskets or fowling pieces. and it wasn't common to have rear sights on such guns.