This is probably first variant of EU version of Sony NP-FW50 battery. Oldest ones that I have encountered were manufactured in 2010 while newest ones in 2014. All analyzed copies have same micro QR code either with sharp edges or slightly rouned, fuzzy ones. They weight around 58 or 59 grams and have serial number starting with letter K. There are no hologram stickers or any additional markings on those batteries.
This is copy manufactured in 2010 with sharp QR code: