Is there a source for very old historical stock data, starting from the 1900's? I am interested in this information for the purposes of personal historical research.
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Did a little research by using oldest public company (Dutch East India Company, VOC, traded in Amsterdam Stock Exchange) as search criteria and found this lovely graph from http://www.businessinsider.com/rise-and-fall-of-united-east-india-2013-11?IR=T :
Why it is relevant? Below the image I found the source of data - Global Financial Data. I guess the answer to your question would be to go there:
Hope this helps and good luck in your search!