John Comnenus -Ducas (1237-1244) Half tetarteron Mint of Thessalonica

Interesting coin, I never thought I would be able to acquire one, In fact I did not know what is was when I bought it but I loved the design and needed to add it to my collection. I was very lucky.

This coin is found as a half tetarteron and as small module trachy, the DOC catalogs list is as half tetarteron, mine is a flat coin, not concaved at all. It is also small 17mm and weighs 1.1gm This makes the flan smaller than normal but is extremely rare so not many examples to compare it to. CLBC grades it as a rarity 5.

Not sure if I should clean it, the green is stable so not bd.

 

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Cool coin @BenSi - nice addition to your collection. I would not clean it, however. Seems fine as it is.

 

I doubt that verdigris will come off without leaving unsightly pitting beneath it. Leave it alone.