Source: https://www.leitz-auction.com/en/Anastigmat-3-5-50mm/AI-19-12325
Source: https://www.leitz-auction.com/en/M2-Schwarz-Lackiert/AI-19-12359
Source: https://www.leitz-auction.com/en/Summicron-2-35mm-Schwarz-11309/AI-19-12376