please help about that tokens

[apostrophe]

please, could you help me to identify that trade tokens? where and when were they used and olsa what for they were used. maybe there are some collecters who have got that token in their collection.

ı think it is a trade tokens issued by a German enterprise in Istanbul, but before 1923 (in the ottoman times) . The question is, what trade ? who were they?

thanks a lot....

[apostrophe]

that the tokens

[Volker1]

Dear apostrophe,

my english is not good, but i will answer.

I have a germanophone token catalogue:
Peter Menzel, Deutschsprachige Notmünzen und Geldersatzmarken im In- und Ausland 1840 bis 2002, 2. aktualisierte Auflage 2005.

Konstantinopel (today Istanbul), Turkey

Nominal: 10; 20; 40; 60

This tokens are "Geldersatzmarken"; category "Marken einer sonstigen Ausgabestelle".

Catalogue value: 18 - 20 Euro per token.

Period: is not specified; I think before 1923

Best regards

Volker