Concise No. 300
Well here is a brand new Concise No. 300 circular slide rule from the only company that still manufactures slide rules.  This is a magnificent piece of equipment 11 cm in diameter, versatile and nicely priced.

Obverse Side:

K, A, D • C, CI, B, L

 Reverse Side:

LL₃, LL₂, D • C, S, T₁, T₂, ST