CONCISE No. 28 and No. 320 Circular Slide Rules with Case & Instruction Booklet

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CONCISE No. 28 and No. 320 Circular Slide Rules with Case & Instruction Booklet :
$19.99

The 2 vintage Japan made slide rules come with original cases and instructions and they are both in very good condition. The No. 320 is some 3 3/4 inches and the No. 28 is just over 3 inches in diameter. The No. 28 Has a green maple leaf and Phillips Cables Ltd. logo in its centre.