AR Dirham from Volzhskaya Bulgaria

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First three rows: 'faith symbol'
Fourth row: Ahmad ...
mint Madjar?
date 387 AH (997-998 AD)

'faith symbol' continuation
khalif name at-Taee
person's name Adud ad-daula Abd ar-Rakhman ibn Mumin

Metal: low quality AR
Diameter: 30.6-31.3. mm
Weight: 3.34 g

Any additional information highly appreciated.
Chinese Coinage Web Site