[sidney]

Roland,

3.(l)/JG 135, which was indeed formed on 1 July 1937, was not direct predecessor of 3./JG 233.

I.(l)/JG 135 was the only fighter Gruppe directly involved in the annexation of Austria. The Gruppe left for three Austrian airfields on 12 March 1938, and was based there until 30 March* 1938, when its two He 51 equipped Staffeln returned to Bad Aibling.

The third Staffel, the one equipped with the Bf 109 B aircraft, was left behind at Wien-Aspern to form the backbone of the new I.(l)/JG 138 along with the two Staffeln from the former Austrian Jagdgeschwader II. In return, the Austrian Geschwader gave its 5./JaGeschw II, commanded by Lt. Erich Gerlitz, to I.(l)/JG 135 to form the new 3.(l)/JG 135 (2nd formation).

This I think is how precisely the influx of the Austrian pilots to the otherwise originally Bavarian Gruppe happened.
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Horns (and skull) of Alpine ibex on a light-blue shield with a black-and-white border was the Gruppe emblem of I.(l)/JG 135, later I./JG 233, and not the 3.(l)/JG 135 Staffel emblem as one might understand from your post.

If you try and Google the Alpine ibex, you will see the profound difference in the respective size of their horns, although in general the two species might belong to the same family of species.
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I thought that in my last post I suggested the possible link of the unknown chamois emblem as direct predecessor to I./JG 51 chamois on the Alpine peak emblem.

Regards,
Sinisa