Hi Tom,
Couple of items which might be of interest:
http://www.aviationarchaeology.com/s...ly/Mar1941.htm
See: 410328 - PT-13B - 40-1644
http://www.aviationarchaeology.com/s...ly/Feb1942.htm
See: 420208 - AT-6 - 41-235 & 421020 - BT-13A - 41-10875.
Same man as your Wyatt Coke?
Col.