THIS IS A PRE-PAID 'REGISTERED LETTER' ENVELOPE SENT IN 1923 FROM CARLISLE TO LONDON.  IT IS CANCELLED WITH TWO CARLISLE SINGLE RING DATESTAMPS OF 19/3/23, AND ON THE REVERSE THERE IS A LARGE PART LONDON REGISTERED HOODED CIRCLE OF THE FOLLOWING DAY IN VIOLET.   IN THE TOP LEFT CORNER THERE IS A CARLSILE REGISTRATION LABEL NO.2198.   I AM SELLING IT WITH FREE POSTAGE WITHIN THE UK.