Three double-sided sheets of equestrian studies

Specific dimensions are as follows:
5¾ x 6 5/8 in. (14.6 x 16 cm.) (i); 5¾ x 7 3/8 in. (14.6 x 18.9 cm.) (ii); 6 3/8 x 7 5/8 in. (16.2 x 19.3 cm.) (iii)

Signature: Two on ledger paper, one with printed date '183*'