Every time I find one of these I look very carefully to see if there is no missing £ symbol. I doubt I will ever find one used but you never know.

This is SG Y1747 and with the missing £ it has a catalogue value of £175 MUH.   Used as shown it is catalogued at £5.50 each; so nice to see a pair in this condition.

Keep searching that kiloware :-)

Have a great weekend ... Michael

and to fill a gap in your collection at something less than £175 or even £5.50 just visit http://www.cddstamps.com/bidstart_store.htm where I now have over 7100 lots listed and at competitive prices and all correctly described.