squared circle-cancellations on postcards (or letters) with cheap stamps

[Olaf-SF-covers]

Do you have a collection which you aren't interested to complete anymore? I am from Germany and I have a collection of about 60/70 % but besides some of the cheap ones espc. the rarer cancellations are missing. I am not collecting subtypes (BUT: If in Whitney-catalogue there is a note that a cancellation exists for Victoria and Edward VII. then I collect both). If you think you have sth for me please send a scan (or more than 1) - but not more than 20 MB in one E-Mail - to Olaf.Groth.N@gmail.com