STAMPS OF THE FRANCO-PRUSSIAN WAR (1870-1871)
In 1870 a series of stamps was issued for use in Alsace - Lorraine. They were withdrawn from circulation at the end of the war in 1871, and overprinted German stamps were used until 1918 when Alsace-Lorraine again reverted to French sovereignty.
However it appears that there was a reimpression of the stamps of 1870 in Hambourg in 1888 and this issue is known as 'dites de Hambourg.'
To differentiate between the reimpression and the original take the diagonal from the SE corner of the frame to the NW corner of the frame.
In the original of 1870 the diagonal bisects the leg of the 'P' of POSTES at its junction, while in the reimpression the diagonal barely shaves the 'P.'
As far as I can ascertain this variety is not listed by Yvert & Tellier, Ceres or Stanley Gibbons. However it is listed by Dallay (Page 648 in 2004/05 catalogue), and by Thiaude. I believe it is also listed by Scott.