Seeking input on construction-based dating of a 19th-century chair

I’m looking for opinions on the dating of this chair

H: 90 cm
B: 45 cm
D: 45 cm
Seat height: 45 cm

On close inspection, the chair appears to be handmade rather than factory-produced:

• The rear legs and back posts are each cut from a single solid piece of wood, forming a continuous curve (not laminated or steam-bent).
  
  
• The crest rail and central back rail are tenoned into the back posts, with no evidence of original bolts, screws, or metal reinforcement.
  
  
• Seat rails are mortise-and-tenon joined into the legs. Existing splits follow the grain and show darkened edges consistent with age and hide glue.
  
  
• Interior surfaces show hand-plane and scraper marks, not router or pattern-milling marks.
  
  
• Support blocks, slotted screws, and upholstery appear to be later repairs or reupholstery, not original to the chair.
  
  
• I see no evidence of standardized parts or jig-based symmetry typical of late 19th-century factory furniture.

Stylistically, the chair has restrained curves and modest scrollwork rather than heavy ornament. While this could loosely align with Louis XV/XVI / Louis-Philippe–era forms which was popular from 1840-1870, my dating assessment is based primarily on how the chair was constructed, not decorative style.

Based on construction alone, my current working date is mid-19th century (roughly 1840–1855).

 

Gentle rinse and first layer (of 3 total) wax - im firmly confident that its mahogny, and of french origin (style + use of mahogny).

 

2/3 layer of beewax and polish

 

Nice! The wood looks great!
Balloon-back side chair ca.1870, part of either a dining set or parlor set.

 

Nice chair!