Bought this tripod today but can't find the exact same

The Tripod has the markings D.R.G.M. on the connector but no number and the legs are rounded triangles (Length: 40cm diameter: 2.2 cm) I only found these tripods with round legs which were next to each other not each leg as part of a circle. I would love it if someone could tell me the patent number or D.R.G.M. Number since I'm interested in the age of the Tripod