SA Centenary in the UK (and the world)
Postmark: Various (this is: Liverpool)
Cachet: William Booth / open air
Stamps: Two sets with ordinary & phosphor stamp set. SG 665 – 666.
Size: 164 x 108 mm
Remark: I’m a bit uncertain about cat. value, but have seen mentioned £60. Covers with both set of stamps are rare. Estimated value = £30.