Possibly medieval silver coin ID help please

[Benjamin52]

Hey everyone,
I went detecting in the woods close to a medieval monestery ruin here in Germany today.
I found this small (aprox 1.5cm) silver "coin"?
It has what looks like an arabic castle or cathedral with an arc of dots above it on one side and a strange picture on the other with little dots going around too. It looks like it has seen some abuse and might have either been bigger or hammered imprecisely.
Any ID would be appreciated!
Any ideas how to clean it without ruining it?
Thanks for looking!

 

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[cudamark]

Other than carefully removing dirt, I'd leave it like it is. Looks good to me! Cool coin, I hope someone can I.D. it.

 

[Benjamin52]

I posted on a German numismatic forum and they told me the coin is actually not the Pfennig (penny) but the slightly lighter (0.7g) and rarer Obol(Hälbling=halfling) from 1238-1261 with Titel Elect Cologne, under Arch bishop Konrad von Hochstaden 1238-1261.

http://www.ma-shops.de/olding/item.php5?id=260902

Value might be over 250 EUR in this condition

 

[coinsareawesome]

Very, very nice! I personally have never seen a coin that looks like that, and am very surprised at the value. An extremely nice find! Well done!

 

[kcm]

Now I don't feel so bad bombing out on my search last night. Must've looked through a couple thousand different coins. BUT YOU FOUND ONE!!