Into the Deep Blue
This post will be a continuation discussion about the French Bordeaux issue of 1870-71, and the sometimes confusing similar "Ceres" issues of 1849-50, 1870-73, and the French Colonies imperforates of 1871-77.
For background and introduction, read:
The lithographic Bordeaux 4c gray has a hefty CV of $200, and is a bit more uncommon than some of the other denominations. It shares the same design as the 1c and 2c denomination Bordeaux stamps.
One doesn't need to worry about confusing the typographic 1849-50 "Ceres" issue, as this frame design was not used.
The Bordeaux 4c gray shares the same characteristic of the other Bordeaux stamps: namely thick curved horizontal lines for the neck markings, and an overall cruder appearance because of the lithographic origins.
The 1870 typographic "Ceres" 4c gray looks similar (CV $40), but the stamps for France are perforated.
Out of the Blue
One can see that the various "Ceres" issues can sometimes be confused with one another. But, generally, the Bordeaux issues are enough different that they can be positively identified.