Engrossing hand

(Penmanship) a fair, round style of writing suitable for engrossing legal documents, legislative bills, etc.

See also: Engross

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
Mr Squeers, not being remarkably erudite, appeared to be considerably puzzled by this first prize, which was in an engrossing hand, and not very legible except to a practised eye.