Read this and answer the question. If the question is unanswerable, say "unanswerable".

In the 51 years prior to the Empire Stadium opening, the final (including 8 replays) was held in a variety of locations, predominantly in London, and mainly at the Kennington Oval and then Crystal Palace. It was played 22 times in the Oval (the inaugural competition in 1872, and then all but two times until 1892). After the Oval, Crystal Palace hosted 21 finals from 1895 to 1914, broken up by 4 four replays elsewhere. The other London venues were Stamford Bridge from 1920 to 1922 (the last three finals before the move to Empire Stadium); and Oxford University's Lillie Bridge in Fulham for the second ever final, in 1873. The other venues used sparingly in this period were all outside of London, as follows:

In what time period was the FA cup final played outside of London?
unanswerable