Kriegsmarine NCO visor Hubner & Bollwitt, Hamburg 11, Vorspetzen 52

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Hello guys, I have acquired what appears to be a Kriegsmarine NCO visor with a small sweatdiamond, covered by a brittle celluloid. Does anyone know of a Hamburg maker Hubner & Bollwitt? The interior sweatband has a stamp "Reserve Lazarett II, Schleswig" upon a google search this was a POW hospital. Although Scheswig is relatively close too Hamburg I can find no reason why a Kriegsmarine visor shoukd be so stamped. Stamping is old and not easy to read without a loupe Does anyone know this maker? Did this maker survive post war? Thanks regards and best, cheers Ryan

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also date stamped 1942 below hospital stamp

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Is Hubner and Bollwitt a known or listed maker? Ican;t find any reference to them. Thanks cheers and best, Ryan

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any opinions/info ? Thankyou Ryan