Well I don’t know how well trusted or accurate their graders were, but according to this conversation chart
https://weightoncoin.co.uk/index.php?main_page=index&cPath=228
Unc 85 is equal to MS 65 on the Sheldon scale.
So if a buyer is well versed in Grading and he/she agrees the coin inside is MS65, then being in that slab shouldn’t affect the price that much, however if there is disagreement on the grade to that recorded on the label the achievable price drop.
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