I came across an old dash panel that looks very similar to the Q/U dash
number/letters are HD571? last is a 3 or 2
do not know why picture rotated
28Q
Production
Model Name Production Plant Serial Number Engine Number
Starting Closing Starting Closing Starting Closing
4 June 14, 1928 January 2, 1929 Detroit HL-950-P HD-999-D Q
It is definitely a Plymouth Q probably built some time in August of 1928.
See link: http://www.1948plymouth.info/SupportPages/FEDCO_Information.htm (http://www.1948plymouth.info/SupportPages/FEDCO_Information.htm)
Chet...