French Model 1823 Lance

[bobinwmass]

 I recently picked up what I'm told is a French Model 1823 Lance, and from my brief research that appears to be correct. It has the different 
length langents on the lance head (one being very long) and the rectangular holes for attaching the pennant. Both the lance head and haft are stamped "GD" with crown above. Can anyone tell me what that stands for and the dates it was used? The pennant on the lance measures about 30x12 inches and has some mothing. I'm sure it is not original to the 1823 period, and the leather cord attaching the pennant to the lance is certainly modern.  But I'm told lances like this could have been used later in the Franco-Prussian War and even WWI. Is that true, and if so could the pennant date to either of those conflicts, or is it simply a later but still old reproduction? Any info or thoughts about the lance or pennant would be greatly appreciated. 

[Mr.Jerry]

can you post a close up of how the attachments work?

[bobinwmass]

A few other photos