The exact value of a 1910 Colt 22 caliber mini handgun would actually be highly dependent on a number of factors. Most importantly, the condition of the handgun.
The Desert Eagle was never made in .40 - available chamberings included .357 Magnum, .41 Magnum, .44 Magnum, .50 Action Express, and .440 Cor-Bon.
Which model, what condition, condition, and condition?????
50-200 or so
50-100 or so
10-200 USD or so
100 or so
50 or so
Impossible to answer without knowing if it is a rifle, handgun, shotgun and the caliber/gauge.
Impossible to answer without knowing who made it.
30-60 USD or so
5-50 or so