Congrats on a good find
<span style="font-size: medium; font-family: georgia,palatino;">Hmm...about 1985-7ish for the blue LE, and 1987-9ish for the brown...I think that's about right. </span>
<span style="font-size: medium; font-family: georgia,palatino;">Not sure about the States, but in Canada, the blue LE was the economy model for the Hi-Tech 2100, and the brown for the System 90. </span>