These white Nylon rulers with Stainless steel fittings are first seen c.1966 when they were introduced as a 2 foot rule. [Item #2250]. Around March 1968 the line was expanded when the 3ft #2250 was introduced.
[See below]
Around 1971, due to metrification in the UK a 1 metre rule [#2251] was produced and also a #2252 was to be had with dual metric and imperial scaling.
The 2ft-3ft 2250 lasted from 1966/1968 to August 1973
The 2251 and 2252 lasted from 1971 to September 1980.
GALLERY
The first rules [ 2ft 2250] were issued with solid numerals but they were found to wear badly such that by the time that the 3ft 2250 was introduced the numbers are more ‘modern’ and skeletal…see below
The first issues of the 2ft 2250 were retailed inside a plastic sheath:
Below are the later 2ft and 3ft 2250 rules:
They were issued in boxes of 6:
Here is the fully metric 2251:
Below is the 2252, showing the inside and outside faces, and box:
