Those stampings indicate 1969 model year car.. also there should only be 1 stamping that starts with P, the second character 9 indicates the "model" year car the trans is for. The partial VIN third character is a B, = out of a Baltimore built car. The trim tag pictured is a Flint built car, the car should have F in the VIN. For example My November 1969 built 1970 chevelle (numbers and POP matching) trans is P0R29A 0= 1970 model year R29= October 29 1969 A= M20.
Look here!!
http://chevellestuff.net/qd/muncie.htm
So my opinion is that that is a transmission from a Baltimore built 1969 car. With 2 assembly dates for some reason.