Congratulations,Your coin is not included into any catalogue till now.
I know the mistake DVCS in 1527, 1528 years, but with different type of the Eagle.
Can You send the scan of the coin in 1200 dpi or the pictures 1000x1000 on white surface and the name of coin owner to my email gdrs.bagdonas@gmail.com?
We will include the coin into nearest issue of the catalogue of Lithuanian halfgroats of Aleksander Jagiellon and Sigismund the Old.
The current issue of this catalogue came without this coin, unfortunately.....