The only easy assumption: Constant births per year
From 1948 to 1973 is 25 years.
646A to 999A is 354 volumes.
1B to 829B is 829 volumes.
Total volumes is 354+829 = 1183
646A to 44 B is 354+44 = 398 volumes
1183 volumes in 25 years is 47.3 volumes per year
Expected years from 1948 to volume 44B = 398/47.3 = 8.4 years
Expected year for 44B = 1948+8.4=1956.4
That is not that far from April 1959 considering that I assumed a constant number of births per year. If that rate was slowing down with time then it could have taken a few more years to get to 44B. Not good news.
Good analysis! No, its not good news. I honestly have believed that the Bomford BC was a fake...No opinion on the Kenyan BC...Now I am not so sure. Thanks for taking the time to look at the non-existent data we have.