US 8.4c Bulk Peace In Music Overprint Black Bars With No City State

I have been looking at US overprints. I think it interesting that postal services overprint on the original stamp. It just seems the more times you touch something the more chances you have for something going wrong. I have a 8.4c Peace ... Music bulk stamp. I noticed what appears to be the overprint bars, but no city state. I think of this as the train tracks with no train.

Is this an overprint missing information? and if so, how often does this happen?

Is there an overprint forum because I have some overprint questions?

My first post in the stamp forum. If this is the wrong place, place provide some feedback on a better forum.

thanks
Mike

There is a U.S. Precancels category. The moderators can move this thread there.

Quite normal, quite common, the generic Bureau precancel variety of 1615Cd,

About Sept. 1978, the Postal Service changed their policy of requiring city, state as part of precancel. From henceforth, plain lines or bars were only requirement. First shipments of the 8.4c Piano "lines only" printings from the Bureau of Engraving and Printing in Washington D.C. started in October, 1978.

(For the Americana series coils also provided precanceled, the BEP did their precancel overprinting on same press at a precancel unit positioned down-stream from stamp design printing unit. So comment about something going wrong should be in this context, no greater or less chance than some other errors "on the press.")

Confidential to John B: Please contact me direct if you have not already done so, thanks.

Thank you. I have just started researching overprints. Quick and helpful response is appreciated.

love the historical context. I think the city, state on the overprint help understand part of the stamps travels...

thanks
kyw