vintage Warner B-1 slide graphic computer, 50s airplane pilot's slide rule for flying calculations

Vintage 1950s Warner Instruments B-1 slide graphic flying computer for pilot in flight calculations. This is from the 1950s (the address on the bottom is Chicago 56 (dating it to no later than the early to mid 50s). It is in nice condition (does have an owner's name on the bottom corner).

We've been told that this is the earlier model of the Jeppesen improved B-1 that is used by Mr. Spock in several episodes of the original Star Trek TV series.