[jocko]

There was no medium blue (510) in 69 (only light (code 507) or dark (code 508) and the only two-tones in 69 were Conventional (white top) Special (white top and bottom). 71 was first year for the Deluxe two tone - but none of the Deluxe two tones had a pri color roof, it would have been white, like the middle section. Since it's a repaint, no telling if it is 69 GM dark blue. The paint scheme you currently have (i.e. white middle only) was never offered by GM until the squarebody years. As for the seat, someone probably just swapped benches or installed a 71/72 cover. Does your interior paint match the exterior color well AND look fairly worn out (as in not-repainted)? If so, that's an indication your exterior paint could be original GM dark blue. Nice looking truck!