Assistance to ID Byzantine coin + what is the best Byzantine coin reference work?

Recently bought this piece. It was fairly inexpensive and thought I would take a chance.
It was unceremoniously listed as 12-14th century, which may/may not be correct.
Any ID help, or guidance on where/how to ID this piece would be most appreciated
And of course, what is the best, most comprehensive Byzantine reference book out there?
It was unceremoniously listed as 12-14th century, which may/may not be correct.
Any ID help, or guidance on where/how to ID this piece would be most appreciated

And of course, what is the best, most comprehensive Byzantine reference book out there?

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Comments
His Byzantine reference choice is ERICII by rasuel Suarez? Not sure on spelling.
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Discoverer of 1919 Mercury Dime DDO - FS-101
<< <i>I'm at a coin show now, and the ancient dealer next to me thinks it's 12th century Bulgaria.
His Byzantine reference choice is ERICII by rasuel Suarez? Not sure on spelling. >>
Thanks! I also have the ERIC II, but I'm away from home now. I haven't opened the Byzantine section of that book yet.
David Sear's Byzantine Coins and their Values is the best bang for your buck on Byzantine. Not the most comprehensive, but very good for the money.
The most comprehensive Byzantine reference is probably the Catalogue of the Byzantine Coins in the Dumbarton Oaks Collection and in the Whittemore Collection, but it's a 3 volume set that costs about $500.00 I think.
https://www.civitasgalleries.com
New coins listed monthly!
Josh Moran
CIVITAS Galleries, Ltd.
Ivan Alexander (1331-1371)
Second Ag type - with his son Mikhail Assen
Mint: Tarnovo
Many variants (some people estimate 10-15 million minted)
References:
Mushmov 1912 - Pl.LXIV.9-3
Mushmov 1924 - Fig86-105a
Iurukova, Penchev 1990 - Pl.VIII.76-82
Dochev 1992 - Pl.XXXII Pl.11.2-6
Radushev, Jekov 1999 - p.138-139
Dochev 2003 - Fig.40-43 Pl.XIII.1-12
<< <i>Bulgaria
Ivan Alexander (1331-1371)
Second Ag type - with his son Mikhail Assen
Mint: Tarnovo
Many variants (some people estimate 10-15 million minted)
References:
Mushmov 1912 - Pl.LXIV.9-3
Mushmov 1924 - Fig86-105a
Iurukova, Penchev 1990 - Pl.VIII.76-82
Dochev 1992 - Pl.XXXII Pl.11.2-6
Radushev, Jekov 1999 - p.138-139
Dochev 2003 - Fig.40-43 Pl.XIII.1-12 >>
WOW, now that was more than helpful