The brass lens hood is very elaborate. The aperture shown here was taken before the pickling process. Normally the inside is black.

The original dimensions of a comparable aperture are used. In the example shown for a customer a Dallmeyer 2A

After acceptance and measuring, an exact replica can be produced.  Link Lens Hood Standard

Artificial ageing of the brass is possible on customer request.

 

Translated with www.DeepL.com/Translator (free version)