1888 ISSUE

"OS" in Black on 1888 Queen Victoria 1p Brick Red
or Vermilion on White laid paper.

Envelope size: 138 mm x 78 mm.
 

"G.P.O." in three concentric ovals. With "Specimen" overprint.
With round "O" and slanted "S" in "OS".

"N.S.W." and "G.P.O." in three concentric ovals. 
Used by the Government Printing Office

1889, JULY 1: SYDNEY to BALMAIN
a
Envelope size: 145 mm x 80 mm
Envelope size: 145 mm x 90 mm

BOTH SIZES NOT RECORDED