1700, asking for approximately value and rarity..

If you searched on SUUM CUIQUE, you would find this:  ¹⁄₁₂ Thaler - Friedrich III - Brandenburg-Prussia – Numista

When there is a common German coin where I would like to know the market value, I go to www.MA-Shops.com.  If you put in the search terms Brandenburg 1700 1/12, you will find some coins for sale in a comparable condition.