I wouldn't buy this helmet. It is too expensive for this condition and not the right helmet. In addition, the patina of the replacement material isn’t nice. Your GGF wasn‘t an officer but an NCO. You would need an M1886 NCO helmet of the field artillery (with curved chinscales).
The following should be more correct helmets, unfortunately without red hairbush. The first is a Landwehr helmet, but if he didn't die before he should have belonged to the Landwehr after his active military service. The 2nd is not cheap and just an EM helmet, but in really good condition and with field-artillery stamps.
Bayern Pickelhaube für einen Unteroffizier der Landwehr Chevaulegers, Feldartillerie oder Train - Bayern - Kaiserreich & Weimarer Rep.: Uniformen, Kopfbedeckungen, Stahlhelme etc. - Militaria / Helmut Weitze
Bayern Pickelhaube für einen Unteroffizier der Landwehr Chevaulegers, Feldartillerie oder Train Fertigung in schwerer Kammerqualität, um 1900. Schwerer Lederhelm, komplett mit allen Beschlägen. Großes Helmemblem mit aufgelegtem silbernen Landwehrkreuz, eckiger Vorderschirm,www.weitze.net
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ERHALTUNG Bayern Pickelhaube 1901 VIELE Stempel 3. Feldartillerie-Regiment [#15] | eBay.de
Bayern Pickelhaube 3. Gut bis sehr gut erhaltene schwere Lederglocke.www.ebay.de
sometimes you have to look at dealers, who have good merchandise and with certainty that it is good, everyone has an opinion about the price, everyone decides what you want to pay yourself