They look fine to me . The one on the scale is a tad light but could be wear .Check the others . The thickness is right on brother , 2.4mm . JMO
Ahhh cheers Sensible, aye just a little sceptical on weight of the one on scale, little under the 26.7 but as say could be down to wear. But most definitely not silver coated, like some of the Chinese copy`s Thanks
They look authentic to me, nothing is alarming of a counterfeit. The weight issue is most likely due to wear; Your coins are pretty worn down (G/VG).
Nothing screams counterfeit about those to me, but an induction test showing their silver content at 90% would be a stronger indicator. Few counterfeiters are making these common dates in 90% silver in F to VF grade (as far as I know).