Want to backtest historical data as far back as possible.

I'm looking to backtest my setups that I trade on going back as far as possible.
The farthest I can go back is from the 1929 crash on the Dow Jones, but was wondering if there are free charting platforms that have data that extend well past 1929 and possibly earlier. Thanks in advance.

 

https://www.measuringworth.com/datasets/DJA/index.php will give daily values from May 2, 1885.

 

This company www.csidata.com could be of help. They have been around for a long time and may have access to such data.

 

1896, DJI
http://stooq.com/q/d/?s=^dji

1789, SPX
http://stooq.com/q/d/?s=^spx

1709, UK index
http://www.bankofengland.co.uk/research/Pages/onebank/threecenturies.aspx