A tool or person used for graffage; someone who performs graffage or creates rubbings.
From 'graffage' with the agent suffix '-er,' indicating a person or tool that performs the action of graffage.
A graffer could be either an artist's tool or the artist themselves—English economy at work, where the same word can describe both the instrument and the person wielding it, like 'painter' meaning both the person and sometimes the brush.
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