Thank you! (Of course much better when printed...)
This Tessar is uncoated but I seldom put a lens hood on.
Must try colour some time.
Additionally I do own an Ercona I with a multicoated Tessar. It is of course "a DDR-made Ikonta" from the period when the Zeiss name couldn't be used anymore. Very good performer but shutter needs attention and I rarely need 6x9.