Very nice.
Correctly executed serrations on the rim.
A stamped (rather than cast) period forgery, interestingly only superficially whitewashed, not whitewashed in white metal like another forgery on offer, made at least with the same obverse stamp.
A small twist, about 15 degrees.
Bleached/silver-plated brass, 28.0 mm in diameter, weight 9.85 g.