Sterlitz was a tiny state. The quota of Mecklenburg Sterlitz was only made of 1 infantery batallion of the 89 grenadier regiment second bat - and a sole battery of 24 Field Artillery Regt this helmet.
In a battery less than 10 officers ... may be someone has a more precise figures.
Differences between Sterlitz helmet for Artillerie and Infanterie was small the chinscale flat for infantery , convex for artillery. At parade the FAR wasnt wearing any Haarbusch . The 2 Bataillon of the 89 GR was wearing white haarbusch instead of the 2 other bataillons of this regiment from Mecklemburg Schwerin who was wearing black ones.
Both helmets are really much more hard to find , and more rare than an Prussian or Bavarian general one ...