Del. Code tit. 21 § 2310
The owner of a motor vehicle, the serial number of which has been altered, removed or defaced, may make application for a special number in the form prescribed by the Department accompanied by a fee of $2. The applicant shall furnish such information as will satisfy the Department that such applicant is the owner, whereupon the Department shall assign a special number for the motor vehicle preceded by a symbol indicating this State. A record of special numbers so assigned shall be maintained by the Department. The title inspector shall stamp the number upon the vehicle as directed by the Department and, upon receipt by the Department of a certificate that the title inspector has inspected and stamped the number upon the motor vehicle as directed, in a workmanlike manner, together with application for a certificate of title, such special number shall be regarded as the serial number of the motor vehicle.
21 Del. C. § 2310