A vintage architect's triangular scale model 'ruler' #21626 made by Dietzgen ~  I don't know how old this is, but do have the original box triangular box which is shown in the picture. It  says 'Made in the USA'. I THINK it may date back to the early 1950's & is therefore 'early' plastic, but am not certain. Shipping $6 (length) - any overage in shipping charges of $1 or more will be refunded.