essay cover 1895 registered envelope essays, inscribed "State of N. Africa", and "Postage and Revenue" and "Registration Fee", depicting a rider on a camel, 2c. in brown (2), one endorsed, "F size" and the other endorsed, "B size", both mounted on "Appendix C (contd.)" sheet dated "Nov. 18th. 1895 and headed "Specimens for 2 annas Registered Envelopes"; very scarce