Hi all,
I presented this coin on CCF earlier this year
http://goccf.com/t/442222 and thought I had an attribution of sorts with John V.
However, on the World of Coins forum, after a lengthy investigation, I was given the following response from the respected resident byzantine expert.
"
The consensus of multiple collectors is that while the Helios 7 coin has the fabric of coins prior to the Cantacuzene Civil War, the below coin (aka yours) is a modern fabrication based on similar type of coins found on Ebay."
I have to comment that to my eye, it doesn't seem to be typical of a "modern fabrication" but I do respect the opinion of others far more experienced in byzantine coins than myself.
I have inserted the comparison coin (top images) and my own (the crusty one) below. Luckily the 5 coin lot it came with only set me back around AUD30, so no real harm done, and a giant money spinner for the fabricator.
Description
Ancients
John V Palaeologus (1341-1391). BI tornese (17mm, 0.82 gm, 12h). NGC (photo certificate) Choice XF 4/5 - 3/5, edge bend. Thessalonica (?). Standing figure of John V holding cross scepter and globe / Patriarchal cross, stars at each end of crossbars, base flanked by B - B (the left reverted). Sear --. DOC --. LPC --. Unpublished in all major references and possibly unique! Dark gray "find" patina intact, edge somewhat bent.
Ex Helios 7 (Munich, 12 December 2011), lot 190 (realized 2,000 euro hammer).
HID02901242017
Keywords:john v BI tornese palaeologus unpublished

The Ox moves slowly, but the Earth is patient.