Hello Glen,
According to my data base, your 29/70 Mauser Parabellum has been made in 1972-1973.
Your pistol seems not stamped at all. Usually the models exported to USA had the FBM Mauser House proof.
Please check internally the Rear Toggle, Side Plate, Breech Block and the Safety Lever to see if the last two/three digits of the serial number are roughly etched. If yes, please let me know.
Visit my web site to have more information about the serial numbering and the Mauser Parabellum special production:
www.lugerlp08.com
Ciao
Mauro