oliver cletrac hg-42

[westcoastblacksmith]

I may be picking up an o c  hg-42      6GA928

how do I find out what year it is? 

thanks
Ryan

[oliverchris]

Mid 1941. Welcome to the wonderful world of Oliver-Cletrac crawlers 
Year   Starting Serial Number
1939   1GA000
1940   2GA884
1941   5GA022
1942   7GA484
1943   8GA702
1944   9GA632
1945   13GA422
1946   19GA994
1947   25GA240
1948   33GA146
1949   41GA896
1950   48GA428
1951   55GA858