On the front of this old German Thaler you see King Maximilian Joseph (Max Ios) of Bavaria (Bavariae) and on the back you see Mary and Jesus (Madonna and Child).
The German Empire did not congeal until 1871. Up to that time several dozen independent German States and cities issued their own coinage under their own rulers. You have a good example of this early German coinage.
If your coin were in average circulated condition, like the coin in our picture, instead of the worn, tainted condition you indicated in your questionnaire, it would be worth much more. Coin collectors pay big money for nice looking coins. They do not want to add unappealing coins to their collections.
Here are the statistics for these old Bavarian thalers and half thalers:
1/2 THALER (33 mm diameter):
worn: $25 US dollars catalog value
average circulated (like our picture): $100
well preserved: $250
1/2 THALER with A mint mark below Max:
worn: $45 US dollars catalog value
average circulated (like our picture): $180
well preserved: $340
1 THALER (41 mm diameter) with or without A mint mark:
average circulated (like our picture): $80
well preserved: $160
All the dates in these series are worth the same. Use our Important Terminology page to convert these catalog values to real values.