Colophons do not necessarily match in language the texts that they conclude, so that we sometimes have a Garšūnī colophon at the end of a Syriac text, or vice versa (as in an earlier place in the manuscript mentioned below). Garšūnī and Arabic are not, of course, distinct languages, but given that the medium in view here is graphic, the clearly distinct writing systems employed for them may matter in a way approaching that which exists between different languages properly speaking. In addition, at least some scribes that used Garšūnī were careful to note the difference, as I pointed out recently.
Here, mainly for the handwriting, is an Arabic colophon at the end of a Garšūnī manuscript: Saint Mark’s Monastery, Jerusalem, № 169, which mostly contains homilies in Garšūnī. (At the beginning there is an excerpt, in Syriac, from the Chronicle of Michael the Great, book 11 of chapter 20, on the Council of Manazkert convened in 726 by Catholicos Yovhannēs Ōjnec’i the Philosopher with Syriac Orthodox Patriarch Athanasios III. Neither Michael nor the title Chronicle are specifically mentioned here, however.)
The kind of Arabic script most often found in the collections I have cataloged is naskh. Less commonly we see ruqʿa, and rarer still is the slanted taʿlīq or one of its derivations, so the handwriting here is of some interest merely for that reason. The script here is characterized by each word being written on a down-slanting line (sometimes with the last letter written above the preceding parts of the word), loosely placed diacritical marks, and some horizontal and rounded lines being notably extended. Perhaps others would like to try their hand at reading it. My transcription (save for one part in the first line that has proven undecipherable to me so far) follows below. By the way, the year is given as 1092 AG, but this must be a mistake for 2092 AG (= 1780/1 CE), so the full date as given below would be May 1, 1781; a purchase note at the end of the manuscript is dated 2102 AG (= 1790/1 CE). The scribe, also named earlier in this manuscript in a Syriac colophon, is called Anīs, who is from Gargar, but this manuscript was written outside Diyarbakır/Āmid.
كتب بداخل مدينة آمد في قلاية البطريركية الايغناطيوسية ادام الله سعادتها ؟ ؟ الينا المعظم المغبوط المكرم مار ايغناطيوس
بطريرك انطاكية بيد احقر عبيد الله واحوجهم الراهب الهارب وانيس باسم قسيس في سنة اثنان تسعين والف للاسكندر اليوناني
في يوم عيد القديس مار ميخايل
اول يوم شهر ايار
رحم الله من ترحم على الكاتب الحقير
وعلى والديه واخوته