The mark above the date appears to be an "S"; in 1827, only 8,700 were minted. Please see pictures and verify for yourself. The top of the S is closed, so it could be a lower case g if that was an actual 1827 1/3 thaler mint mark. I am not a coin expert.

16.8 grams

approximately 123mm in length (4.8 inches)

Please see photos for details. Note lighting variations may alter colors of item in photos.