new file: http://www.svpal.org/~dickel/OK/OKSummary.html
previously hosted as http://dicklyon.home.mindspring.com/OK/OKSummary.html.

Dick Lyon's SUMMARY table of Otis King's patent calculators

Updated version of the published summary statistics table

See "Dating the Otis King -- An Alternative Theory Developed Through Use of the Internet" by Richard F. Lyon, Journal of the Oughtred Society, Vol. 7, No. 1, Spring 1998. Table reprinted here by permission.

This table summarizes the data on known OK units, tallying the number of units found with various features, for each initial letter of the serial number. The key "-" is used for numeric-only serial numbers, and the lower-case keys "a" and "b" are used for the later versions of series A and B. Missing items of information are counted as not available (n/a); the information may have been impossible to obtain, or it may simply not have been reported.


The Summary Table


                keys  -  A  B  C  D  E  F  G  H  J  K  M  N  P  R  S  T  U  V  W  X  Y  Z  a  b 
               Total 24 25  3  5  7  2  2  8  7  3  1  2 13 12  8 29 20 22 18 14 19 18 26 20 15  323
Address
          Brays Lane  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    1
      Tuck+Blakemore  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    1
     Holborn Viaduct 18 17  2  4  5  .  1  .  1  .  .  .  .  .  .  1  .  .  .  .  .  .  .  .  .   49
         Conway Road  .  .  .  .  .  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    1
             Steward  .  .  .  .  .  .  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    1
                none  .  .  .  .  .  .  .  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    1
       Seymour Place  .  .  .  .  .  .  .  1  2  .  .  .  8  4  1  .  1  .  1  .  .  .  1  .  .   19
                ABCO  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1  .  .  .  .  .  .  .  .  .    1
              Geniac  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3  3  .  .  .  .  .  .  .  .    6
      Dundonald Road  .  2  .  .  .  .  1  .  .  .  .  .  .  .  3  3  7  9  5  7  5 11  9 10  7   79
      Calculator Co.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  2  .  .    2
             Whitton  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1    1
                 n/a  4  6  1  1  2  2  .  6  3  2  1  2  5  8  4 21  9 13 12  7 14  7 14 10  7  161
Type
              type A 21 19  2  .  .  .  1  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .   44
              type B  .  .  .  5  5  2  1  4  7  3  1  1 12 12  3  6  3  .  .  .  .  .  .  .  .   65
            type B/C  .  .  .  .  .  .  .  .  .  .  .  .  .  .  4  9  .  .  .  .  .  .  .  .  .   13
              type C  .  3  1  .  1  .  .  1  .  .  .  .  .  .  .  8 14 16 12 13 16 17 22 19 15  158
                 n/a  3  3  .  .  1  .  .  2  .  .  .  1  1  .  1  6  3  6  6  1  3  1  4  1  .   43
Color
       white numbers 14 10  1  .  .  .  .  .  .  .  .  .  .  1  .  1  .  .  .  1  .  .  .  .  .   28
       black numbers  6 13  2  5  5  2  2  5  5  2  1  1 11 10  6 23 15 15 13 11 14 17 21 11 12  228
                 n/a  4  2  .  .  2  .  .  3  2  1  .  1  2  1  2  5  5  7  5  2  5  1  5  9  3   67
Instructions
              3-page  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    1
              4-page  4  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    4
             12-page  2  2  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    4
   8-page unnumbered  .  2  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    2
      8-page stapled  .  .  .  1  .  .  .  2  1  .  .  .  3  .  .  1  .  .  .  .  .  .  .  .  .    8
       8-page folded  .  .  .  .  .  .  .  1  .  1  .  .  3  3  3  3  7  6  4  5  3  7  1  .  .   47
       6-page folded  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1  .  .    1
 16-page pre-decimal  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  4  4  .    9
16-page post-decimal  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3  4    7
Date
                 n/a 17 20  3  4  7  2  2  5  6  2  1  2  7  9  5 25 13 16 14  9 16 11 20 13 11  240
             1920-24  4  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    5
             1925-29  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    0
             1930-34  .  1  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    2
             1935-39  .  .  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    1
             1940-44  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    0
             1945-49  .  .  .  .  .  .  1  .  .  .  .  .  2  .  .  .  .  .  .  .  .  .  .  .  .    3
             1950-54  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1  .  .  .  .  .  .  .    1
             1955-59  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  3  2  .  1  .  .  .  .  .  .    6
             1960-64  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1  2  .  2  .  .  .  .  .  .    5
             1965-69  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1  .  1  .  1  .  .    3
             1970-74  .  .  1  .  .  .  .  .  .  .  .  .  .  .  .  .  1  1  .  .  2  .  .  3  3   11
             1975-79  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .    0
             1980-84  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  1    1
                 n/a 20 23  2  5  5  2  1  8  7  3  1  2 11 12  8 25 15 20 14 14 16 18 25 17 11  285


We still seek information on additional variations, more confirming examples of the patterns found, contradictory information, etc. See the request for info at the bottom of the Top Otis King's page