Four colors that Spratt Patent 1850 Side Tab LRIs are found in. Feb 5th, 1850 is the date that the 'tab' on this style LRI was patented. Left to right: aqua, cobalt blue, green aqua, and deep green. The right insulator is not so 'teal' in person, just a deep (typical) green that most Spratt LRIs are found in.