Byzantine coin ID help

Even though I've drooled over Byzantine coins for years, for whatever odd reason I still didn't have any in my collection until recently. This is my first keeper and I'd like your help in confirming the ID as I'm still a newbie in this area and totally lacking in reference material.
All I know is that it is supposedly a Latin imitation of Alexius III (ruled 1195-1203). It extends to 28mm and weighs 3.1g.

Thanks!
All I know is that it is supposedly a Latin imitation of Alexius III (ruled 1195-1203). It extends to 28mm and weighs 3.1g.

Thanks!
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Comments
There seems to be a growing interest on this forum, (LordM, for example, along with Aethelred) so I imagine you will get the help you require shortly...
is that you end up being governed by inferiors. – Plato
Is it a trick of the eye, or is that coin somewhat concave?
A trachy?