The front derailleur appears to be a Shimano Thunder Bird GTO or GPO, The GPO was 1974-1976 inclusive. The GTO was 1973 and earlier but I'm not sure exactly when it was introduced. If so, there may not be any date codes. The rear derailleur looks like one of the Eagle/Lark variants with the integral guard but I can't positively identify it based on the photo.

I have a 1972 Buyer's Guide with 35 AMF Roadmaster bicycles. I'm not sure if it is complete but the Pacemaker is not listed. There have been some attempts to decrypt the serial number format. While the results aren't definitive, the serial number should get us to within a few years. Given the apparent era, it should be on the left, rear dropout.