j4

Heinkel HD 19a WNr 296 Second one built for the Swedish AF. In Sweden called J 4 Stig

A Junkers J.I (not JII, supposedly J.II as this never existed), factory identification J 4.

The Junkers J 1, nicknamed the Blechesel ("Tin Donkey" or "Sheet Metal Donkey"), was the world's first practical all-metal aircraft. Built early in World War I,

As often the identification of this all-metal biplane here adds to the the confusion. The Junkers firm used an own identification system consisting of the letter J followed by a number ('arabic'). This all metal biplane was identified as the Junkers J.4 in this (factory) identification. When 'J.4' was ordered by the German Army it was allotted an identification in the system used by the Army (and allotted by the idFlieg - Inspektion der Fliegertruppen). This system consisted of a letter (denoting the class of the machine) followed by a number (always in Roman). So this Junkers J.4 was allotted the designation Junkers J.I. Why bother with this ? To identify this all-metal biplane as a Junkers J 1 would relate to the very first Junkers all-metal monoplane which was actually nicknamed 'Blechesel'. See the note above which unfortunately is not correct and further blurs the issue.

I Bow Down to Kees Kort superior knowledge for me to use the J.1 was incorrect . But just so I can feel a little good about my self the J.I was the first all-metal aircraft to enter mass production