I am no expert and unfortunately Wanne's otherwise excellent web-site doesn't say much about the hard rubber models. From what I now, if the letter is off to the side, it is from 1960 to early 70s. After that, the letters and numbers are aligned. In the 40-50, I am guessing there was only the long table slants but am not sure. If you have the box it would help. In the 60s the box was black with red label on top. In the 70s the box is blue and white. After that, white and grey I guess. Ligature, paddle (flat screws) 60s and before. Afterwards knurled, round ones. I don't know about caps for hard rubber models.docteurcouleur said:How can i date my old hard rubber berg larsen ?