Not very much. Can't say off the top of my head without any resources with me, but it is just a regular UK 2 shilling piece. Pretty sure I have a ton of these.
It's a 2 Shilling coin from England. They're common and not worth very much. Those are obsolete since Britain went to Metric Money. Before 100 pence was worth £1 it was 12p to a Shilling and 20 shillings to £1. The obverse reads "Elizabeth II, Queen By the Grace of God" in Latin. On the reverse the "Fid Def" is abbreviated Latin for "Defender of the Faith".
Yep, the pre 1946 Brit coins were .500 fine and the pre 1920 were sterling .924 fine silver. Those are a good place to start, the half crowns go for a song these days. Have fun. Crown = 5 Shillings = 2 Half Crowns = 2 Florins + Shilling 2 Shillings = 1 Florin OK, Now a pre 1920 Crown roughy equals a US Silver Dollar of the same era. The Crown is a wee bit bigger. Hope this helps.