There is a reference to Kolf course at De Olifant inn in Maarssen around 1820 in a drawing by JH Verheyen. (https://www.dezijpe.nl/zhb/pdf/2004041821.pdf) page 19 and (https://docplayer.nl/35505555-Kolf-sport-in-de-zijpe-en-petten-l-f-frank-van-loo.html) . For history of De Olifant Inn See (https://www.deolifant.nl/geschiedenis/)