1888 ISSUE

"OS" in Black on 1888 Jubilee issue.
1p Violet on White laid paper, with pointed or curved flap.

Envelope size: 138 mm x 78 mm.
 
"SPECIMEN" on pointed flap envelope.
"SPECIMEN" on curved flap envelope.

"G.P.O." in three concentric ovals and with "Specimen" overprint.
a
"N.S.W." in three concentric ovals
Mint envelope, low "OS".

Unless otherwise indicated all illustrated envelopes with pointed flaps.