Button with princely crown or princely hat and the monogram "FvBL", "FZvB" or "FLvB" around 1740 / 1800.
Sizes: 24, 22, 19 mm (±1mm)
Theory 1: Old Prussian Dragoon Regiment No. 11, "Friedrich Leopold von Bosse", 1778-1789 „Mitzlaff“
Theory 2: Old Prussian Infantry Regiment No. 5 "Ferdinand von Braunschweig-Wolfenbüttel" (Lüneburg), 1755-1766 „Alt-Braunschweig“
Theory 3: Old Prussian Infantry Regiment No. 16, Freiherr " Ludwig von Buddenbrock", 1776-1782
Theory 4: Braunschweig - Wolfenbüttel Infantry Regiment No. 1 " Friedrich August von Braunschweig-Wolfenbüttel (Lüneburg), 1783-1803
Theory 5: Austria - Military button - the monogram stands for regiment owner: Fürst (Prince) L... von B...
Found:
Germany: 1. Strausberg and Fürstenwalde/Spree (Brandenburg), 2. Rheinland, 3. Koblenz and Donnersbergkreis (Rhineland-Palatinate), 4. Dorsten (North Rhine-Westphalia) coins from the period around 1740-1750 were also found in the immediate vicinity, 5. Emskirchen and Gößweinstein (Bavaria).
Czech Republic: 1. Prague (Bohemia), 2. Kraj pardubicki - Pardubický kraj, 3. Ústí nad Labem and Roudnice nad Labem (Ústecký kraj - Ústí nad Labem Region), 4. Morawy - Morava, 5. Blatna - Blatná (Jihočeský kraj - South Bohemian Region), 6. Surroundings of Svijany / Loukov (Středočeský kraj - Central Bohemian Region)
Poland: 1. Nowa Sól (Województwo lubuskie - Lubusz Voivodeship), 2. Janice near Lubomierz [Battle] (Województwo dolnośląskie - Lower Silesian Voivodeship) - a 1/12 thaler 1768 Braunschweig-Wolfenbüttel was found in the immediate vicinity.
Netherlands: 1. Sint Joost (province Limburg) a Overijsselse Duit ca.1620 and Luikse Liard ca.1612-1650 was found in the immediate vicinity., 2. Roermond
Any further information about the found location is welcome !
Further theories are welcome. The button collector community will be very grateful if you can contribute to the solution of the riddle.
Sources / additional information:
Wikipedia - List of wars and battles in the 18th century (D)
Wikipedia - Wars and battles involving Prussia
Wikipedia - War of the Austrian Succession
Wikipedia - Silesian Wars
Wikipedia - First Silesian War
Wikipedia - Second Silesian War
Wikipedia - Seven Years' War
Wikipedia - Prussian Guelders