New sales:

Sold for $27.45(~11.7 Keys), $28.66(~12.2 Keys) and $17.04(low outlier) on SCM:

https://steamcommunity.com/market/listings/440/Collector%27s%20Sandvich

Sold for $29.99(2x) on Marketplace(~16.5 Keys using 1.8/1.81 value)

https://marketplace.tf/items/42;14

https://cdn.discordapp.com/attachments/396085176096129035/585710732482445332/unknown.png

https://backpack.tf/item/2935178702 4 Day unsold at 10

https://backpack.tf/item/7090730793 Young seller at 10

https://backpack.tf/item/3246843393 Young seller at 10.1

https://backpack.tf/item/6516139885 1 Month unsold at 11

https://backpack.tf/item/2847529970 1 Year(???) unsold at 11

I don't mind keeping the SCM sales in the range, even the 12.2 one. But all of the proof here(new and old) shows that the new ~16.5 sales are clear high outliers. You could resuggest at 10-12.2 right now if you want, though it would be left up for a few days to wait for the sellers to either sell or age a bit.