German East Africa KM#1 [Risolto]

https://en.numista.com/catalogue/pieces11909.html

According to "Standard Catalog of World Coins 1801-1900, 7th Edition - 2012"
there should be a proof line for 1890, unknown mintage

Also, I know Krause (and Numista) list the Gregorian years for this coin, but shouldn't we use Hijra dates here as they are mentioned?
Hijra dates are mentioned on the reverse which reads: "Sharakah Almania, Year 1307"

Feel free to update the coin sheet with the translation of the Arab legend. I always like it when I discover what those legends mean.

Cita: "jokinen"​Feel free to update the coin sheet with the translation of the Arab legend. I always like it when I discover what those legends mean.

​I did already earlier today, and I added the arabic years in year lines comments, still awaiting validation
And I always do arabic translation whenever I pass such coins

So? should the dates change to islamic calendar?

I would say no, leave the information in the comments as the issuing authority was not islamic so the main date was gregorian.