Three items measure the degree to which a person believes an object was created during a specified historical era, contributing to perceptions of its authenticity.
Grayson, K., & Martinec, R. (2004). Consumer perceptions of iconicity and indexicality and their influence on assessments of authentic market offerings. Journal of Consumer Research, 31(2), 296–312.
Free access to 2023+ psychometric scales at PsychScales