Frankly, impossible to answer. Serial numbers 1 through 5 are listed as "tool room models" for Inland. That means only 5 carbines ever made hold that deisgnation. That is far too rare to have an established market value- it would be whatever buyers were willing to pay, and it will depend on the condition. An all original standard Inland carbine is presently selling for $800-$900. An AUTHENTIC toolroom model with provenance (trail of proof of the origin of the gun) would be worth much more than that.