1786...I know I have seen it before, Russian?

I think mmorgan22 is close - but that eagle reverse is indicative of Prussia rather than Austria

It's a 3 groscher

I originally thought the mintmark was "B", but it must be "E" (for Konigsberg), there was no such coins with a B mark (or at least that I could find).

Hey, that's not what the coin itself says. the reverse legend claims: MONETA ARGENT. Although, there's a proverb: If you see a plaque on a bull's cage which says "Lion" don't believe your own eyes.

You went a little too far on your Friedrichs.
Friedrich Wilhelm III replaced Friedrich Wilhelm II in 1797. In his turn Friedrich Wilhelm II replaced Friedrich II in 1786, but FW II's coin types were different.
So what you have is the last year of Friedrich II who ruled 1740 - 1786.

German State of Silesia. 1786-B, 3 Kreuzer. KM# 1023

Indeed it does, have a look at one I found for sale on the bay.

http://www.ebay.com/itm/Germany-Ger...em20bfa08d30

Good job DCH, you must REALLY know you 18th century europeans to have picked up on the difference between the E and a B! Impressive!