India (Cochin state): 1916-39 6p green as SG 37, horizontal imperf proof block of four in unissued colour (SG 37 was issued in red-brown). Fine condition; without gum as normal.

POSTAGE FOR THIS ITEM: UK ('signed for' postage) FREE, UK, Europe & overseas (registered postage) £8.50. Packages with total value over about £50 need to be insured, except by prior agreement. Benefit from free postage for additional items, subject to weight and maximum value. A certificate of posting will always be obtained by me for every package posted. I always try to use obsolete commemorative or definitive stamps when I can, but please note this is not usually possible for registered mail. For anything other than low-weight unregistered postage, particularly multiple purchases, please wait to receive a combined invoice from me sent soon after all lots for the day have ended.