Serial Number and Production Date for Rokon 340's

RT340
    89........July 6, 1973
    94........July 10, 1973
   182.......Aug. 13, 1973
   737.......Aug. 30, 1973
  782........Sept 24, 1973

   806........Nov 7, 1973
   
943.......Jan. 8 1974
   1012.....Jan 18, 1974
   1137.....Feb. 10, 1974
   1328.....April 22, 1974
   1357
------1975 Frame-----
   1563.....Oct. 30, 1974
   1600.....Dec. 11, 1974
   2161.....Dec. 17, 1974
   2341.....July 5, 1975
   2326.....Aug. 19, 1975
   2328.....Aug. 19, 1975
   2376.....Aug. 11, 1975

ST340
    RT340S1390
    RT340S1415
    RT340S1425.....June 18, 1974
    RT340S1459.....Aug. 13, 1974
    RT340S1501.....Aug. 14, 1974
    ST3401663

MX340
    94 
   129.......Aug. 22 1974
   133......Sept. 12, 1974
   137......Nov. 20, 1974
   151......Dec.  2, 1974
   172......Dec. 17, 1974
   173......Dec. 17, 1974
   184......Dec. 17, 1974
   261......Jan. 31, 1975
   335

MX340C
   31.......Sept. 16, 1974
   69.......Oct. 16, 1974

RTII340
   1007.....Sept. 19, 1975
   1017.....Sept. 19, 1975
   2018.....Feb. 4, 1976
   2071.....March 29, 1976
   2072.....March 29, 1976
   2130.....May 21, 1976
   2168.....August 13, 1976

GMR340
   1007.....June 21, 1977

Black Bold Number are known accurate numbers.
Black Number are pretty certain.
Red Underlined Number are educated guesses.