K3 - Serial #5053 , P3 - Serial #994
KRX3: 2nd receiver
KFL3A-2.1K: 2.1 KHz 8 pole filter in main receiver
KFL3A-400: 400 Hz 8 pole filter, one in each receiver
KFL3A-200: 200 Hz 5 pole filter in main receiver
KXV3A: RX Ant, IF Out & Xvrtr Interface
Both receivers have the 2.7 KHz SSB filter
Email me if interested. No responses here, please.