Stamping a trademark on the goods, on the container, or on tags or labels attached to the goods or containers, is a proper method of trademark affixation. See In re Crucible Steel Co. of Am., 150 USPQ 757 (TTAB 1966). The trademark may be imprinted in the body of the goods, as with metal stamping; it may be applied by a rubber stamp; or it may be inked on by using a stencil or template.
When a trademark is used in this manner, photographs or facsimiles showing the actual stamping or stenciling are acceptable as specimens.
When the specimen consists of a stamp on paper, the applicant must explain the nature of the specimen and how it is used.