Rich, you are probably right. As a 33 year Lockheed employee, the only thing I can find is "nearly 10,000" built. They were a little before my time. I have so many minutes, maybe hours, of video of Lefty flying that great airplane as part of the Reno Air Races and airshow over many years. I did have the distinct pleasure of knowing the late Tony LeVier, who demonstrated the 38 to US and Brit pilots as it entered combat in WWII.