Percussion Pistol mounted as a Tanto

Signature:  Mumei
Dimensions:  Overall 13 inches, Barrel 8 inches
Mountings:  Original Aikuchi tanto mounts with very well done lacquer work.
Overall Condition:  Excellent condition.  Very unusual flint lock pistol mounted as a tanto.  This is the only one that i have seen.  Lock mechanism still functions.  All original and complete.  Most likely for the 1800s.