This is a nice 4-margin GB penny black on an entire (folded letter, no envelope), cancelled with the rare and distinctive vermilion maltese cross of Bristol. The shade is confirmed by a clear Bristol circular datestamp on the back, in the same ink. I have included a standard red MX in one of the photos as a comparison ; this stamp is NOT included in the listing. The stamp has four good margins, but the letter and stamp have a horizontal crease. A previous owner has plated the stamp as being 1b, penciled on the cover, but I have not tried to confirm this.
My photos are part of the description. The item "1840 1d PENNY BLACK RARE VERMILION BRISTOL MALTESE CROSS MX ON GB COVER CV £3000" is in sale since Sunday, April 21, 2019. This item is in the category "Stamps\Great Britain\Covers\Victoria (1840-1901)". The seller is "centrefloater" and is located in Lancashire.This item can be shipped worldwide.