One place where I've seen reference to type size is in Reg DD :
Section 230.3 General disclosure requirements
(a) Form
1. Design requirements. Disclosures must be presented in a format that allows consumers to readily understand the terms of their account. Institutions are not required to use a particular type size or typeface, nor are institutions required to state any term more conspicuously than any other term.
Might be a matter of State Law - pretty sure NJ is 10 point minimum on print material.
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Lord,give me patience - and I want it NOW!!!