. . . you've had a General Tightening of your Packard? I have a small collection of Packard service reminders on postcards. They were sent through the mail by car companies for many, many years. I believe these are from the late '30s.
However, this card sent to me by Ron M. is the oldest service reminder card I've ever seen. Postmarked circa 1928, it reminds the owner that he can get his Model T serviced for a labor charge of $20 to $25. Parts? New fender - $3.50 to $5. A set of platforms and rings - $7. Front axle overhaul - $4 to $5. Ahhh, those were the good old days!