https://historynet.com/the-purpose-of-the-pickelhaube-helmet/
The Pickelhaube: What Was the Point of the Prussian Helmet? | HistoryNet
Jul 13, 2022 - Did the spike on the Pickelhaube helmet serve a real purpose?
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https://www.liveauctioneers.com/price-result/casque-de-cuirassier-de-la-garde-prussienne-prussian-guard-cuirassier-helmet/
Casque De Cuirassier De La Garde Prussienne. Prussian Guard Cuirassier Helmet
Casque de Cuirassier de la Garde prussienne modele 1867 de troupe (Garde Kurassier Regiment / GKR). Casque realise en t
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