The 123\CITROËN-DV-4-R ID19B (also known as 123\DV-R) is essentially the same unit as the 123\DS-A or the 123\DS-R : it contains the same set of 16 advance-curves.

Might you require vacuum-advance : specify a ‘123\CITROËN-DV-4-R-V’.

The difference is its shape to fit certain “DV” engines, as Citroën produced in 1966 and 1967. This can easily be seen, by the two M7 – bolts sticking out of the engine, for mounting the distributor. This explains the different shape of this 123-ignition.

The 123\Switch units are easy to install. Preprogrammed original manufacturer ignition curves.
By selecting 1 of 16 available advance curves, this electronic distributor is suitable for many engines
Please take a look in the advance curve table of the specific unit for available advance curves.

CITROËN-DV-4-R = CITROËN-DV stands for the 123ignition type  
CITROËN-DV-4-R = 4 stands for the number of cylinders 
CITROËN-DV-4-R = R stands for straight distributor cap