Antique 19th C Russian Dagger Stiletto Marked with Two Headed Russian Eagle

Antique, 19th-century Russian dagger - stiletto with a sturdy, tapering, double-edged, steel blade, marked on the ricasso with a crowned two-headed Russian eagle, with a shield on his chest, an orb and a scepter in his talons.
The hilt consists of an S-shaped steel cross-guard with flattened, twisted terminals, a shaped grip with an unusual structure of hair-like filaments, possibly a rhino horn, mounted at the base with a gilt silver ferrule adorned with a punched scroll pattern.
REFERENCES: Comparable Russian blade markings with a small two-headed Russian eagle are published in the following references.
"Russian Edged Weapons XVIII-XX c. Russian Sidearms, Polearms and Bayonets" by Alexander Kulinsky, published in 2001. Tom II. Pages: 218, 219. No 27, 28.
"Russian Edged Weapons" by Alexander Kulinsky, published in 2005. Pages: 515, 516. No 7, 8, 27, 28.
 
We will also provide the buyer with photocopies of the page from the mentioned reference together with a certificate of authenticity.
 
We used strong light during shooting to show the hair-like structure of the horn, so the horn in the last two pictures is actually darker.
 
MEASUREMENTS: Overall length 25.5 cm (10 inches).
CONDITION: shows age and use. The steel blade has some light pitting and is slightly bent.