South Africa Pair 4 Cents 1929 De Havilland D.H.60 Cirrus Moth Air Post Stamp (SG 40)

Title: South Africa Pair 4 Cents 1929 De Havilland D.H.60 Cirrus Moth Air Post Stamp (SG 40)
Country Of Origin: South Africa  / Stanley Gibbons UK Cat # 40.
Format: Two Joined Stamps, as new.
Year of Stamp: 16 August 1929.
Condition: Unused.
Description Of Stamp: Four Pence, green with English and Afrikaans, and Lug Pos - Air Post.
De Havilland DH60 Cirrus Moth aircraft.
(I am unable to locate in Scott Catalogue?) 
Postmarked: No.
CC Stock #S169.
Superb: A stamp that is nearly visually indistinguishable from a Gem 100 but is slightly off centre. There may be very small imperfections such as a single shorter perforation or minor ink spots.
Price: R 125.00 Inc Vat for the pair of Stamps.