Caspar Kalthoff

"According to Blackmore's Dictionary of London Gunmakers he was the son of Caspar Kalthoff and worked from 1645 to 1658 in Holland and Dordrecht"

"We now inform you that your Kapert Kaltov now in the service of our great sovereign Imperial Majesty is in receipt of a generous payment and it is now impossible to release to your Royal Majesty, but when the time shall come then Kashper Kaltov shall receive his release from our Imperial Majesty together with generous payment." (March 1671) Britannia and Muscovy - Sid 142