Another correction... I returned from the USA yesterday and today I am going through my CC statement (Mastercard).
on June 17 I withdrawn some cash and it has been recorded at ¥140.869 + ¥220 fee
on the same day I used the CC a few times and each transaction was charged at ¥143.968
Looks like the exchange rate applied to the cash withdrawn was the mid. for the day
https://www.poundsterlinglive.com/history/USD-JPY-2023
While for the money spent directly through the card had a 2.16%~ premium to it.
(since those are %, the weaker the Yen, the higher the premium)