Month of manufacture?

This past weekend I drove to Bivins, Texas and bought a 1949 Farmall Cub. The serial number is 59981. Can anyone help with the MONTH of manufacture?
 
Whew, that was quick!

I was about to rib Michael a little bit before suggesting that he interpolate the span of numbers for the year, being careful not to come to a conclusion contradicted by the dates of any casting codes he could find. And then mention that, if his gods were smiling, you might pop in with a better idea. '8^)

I know most of the standard references (thanks for all your work on them!) list the year, and are plenty handy for that determination. I don't want to open a can of worms for you, but were there actually monthly records? Subject to adjustments for sales and promotions of course, was production generally level from month to month in a given year? I'm thinking in terms of whether interpolation is a generally reliable way to estimate the month of production, apart from the obvious disruption of the war years.
 
I re-checked the serial number list for this forum and the book Farmall Letter Series Tractors by Fay and Kraushaar. Both indicate the serial number 59981 to be 1949. When I do proportional math, I arrive at 17 January 1949 for an approximate manufacture date.
I used 22 working days per month. Average production in 1949 was 3475 per month. Without some other source of data, that is as good as any guess.
 
Thank you! I've said it before, but don't think it can be said enough. The research you've done and published and otherwise shared, and your participation on forums like this. . . just can't thank you enough.
 

There's an extra http:// at the beginning, and a period at the end of the link that you need to remove.
 

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