Light tan?
The parts on the left (and top) are regular Tan / Brick Yellow. The Duplo figure on the right has Light Brick Yellow hair.
The liftarms on the right were probably factory quality rejects. They were given to a child that loved to build with LEGO Technic somewhere around 1997-1999. It is noticeable that both liftarms have slightly different shades, and both are clearly much lighter than regular tan.
Regular tan liftarms were used in sets in 2000, 2007 and 2009. It is possible that these parts were a production error for the 2000 sets.
The known Light Brick Yellow parts were made somewhere in the 2004-2006 period, but the colour might have been planned or used in prototypes earlier. That is another possible origin of these odd coloured parts.
Light tan?
The parts on the left (and top) are regular Tan / Brick Yellow. The Duplo figure on the right has Light Brick Yellow hair.
The liftarms on the right were probably factory quality rejects. They were given to a child that loved to build with LEGO Technic somewhere around 1997-1999. It is noticeable that both liftarms have slightly different shades, and both are clearly much lighter than regular tan.
Regular tan liftarms were used in sets in 2000, 2007 and 2009. It is possible that these parts were a production error for the 2000 sets.
The known Light Brick Yellow parts were made somewhere in the 2004-2006 period, but the colour might have been planned or used in prototypes earlier. That is another possible origin of these odd coloured parts.