I will leave it to the people that do know [επιλυμένο]

I suspect it is Spanish Castile-León

Diameter 24-26mm

Weight 1.63g

I will buy a Loaf of Bread for the poor. 

(A token of Gratitude, passing it on)

 Similar - https://www.ebay.ca/itm/165422904248 

Henry III. Spain. 1 Blanca. (1400-1406). Toledo Mint 

Hi

Thanks for the reply.

Sorry to ask you, but it is educating me

How do you see the mint mark?

Sorry I see “T” under castle

Mine appears to be a “B”

Identifying mint mark, 

Best regards 

Herman

 Pictures therefrom, assuming the seller got it correct 

With the help of the Toledo mint hint:

N#107660

N#123042 

 That page says it is not a letter, but a shell, under the castle. 

 Therefore, as yours looks to have a B there, then the eBay seller 

has maybe got it wrong. Though for now, yes it is a Spanish coin. 

 I see other questions and replies while writing inbetween. 

ZacUK

N#123042 

 That page says it is not a letter, but a shell, under the castle. 

Size and weight doesn't fit the OP's coin.

 Maybe if I try to read the lettering, then see which coin it may be. 

HENRY III. Spain. 1 Blanca. (1400-1406). Burgos Mint. AB#597

This one?

What is the AB#597

(sorry optimising research resources)

Or this:  N#122744

rsirian1

It fits.

Weight and diameter also

coinbrokers

rsirian1

It fits.

Weight and diameter also

But which? Toledo or Burgos?

Burgos fits, Toledo does not. It is definitely a B

 I think the eBay seller got the right coin, wrong mint. 

Edit - although, maybe it was correct - just not the Burgos mint! 

Royal Mint of Burgos (Real Casa de la Moneda de Burgos), Spain 

 Only done with clear letters. Obverse starts at top, reverse on right. 

From that last link - N# 122744 

Lettering: IOHANES DEI GRACIA REX 

Unabridged legend: Iohannes Dei Gratia Rex 

Translation: John King by the Grace of God 

I can Only Thank you for your Brilliance and assistance

I have learned valuable lessons today

I will spread my knowledge gained and promote the Hobby of Kings

Thank you very much.

Best regards 

Herman