What Is It And What's It Worth?

I just got this at a Flea market. I know it's silver but Ithat's all I know. Can you help with the ID? Is it real? what's it worth?

Thanks for the help.

Obverse:R.IMP.HU.BO.REG.M.THERESIA.D.G. UNDER BUST: S.F.

BACK OF COIN:

ARCHID.AVST.DUX.BURG.CO.TYR.1780.X


THANKS FOR THE HELP!

 

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I think your coin is a "Maria Theresa Thaler".
Does it looks like this?

 

That's the one!

 

It might be worth about $10+ dollars...

here is a website about them

http://www.jdsworld.net/article/m_theresa_thalers.html

Speedy

 

Well since I only paid $7, I feel better. I had a feeling it was something along these lines but there was always a chace it was legit. I cibsider it a lottery ticket and I broke even.

Thanks for the info!