my 73 A and 71 A are the same numbers save for the second row of 4 numbers. The bottle itself reads Assy' # 2771948 despite it saying 2771975 on both of them.
70/ 71 e body pump reads
277197(5)?
0493
72 up e body reads
3431895 440378
2342
also, the 72 up E body pumps have the hose mount to the side, whereas my others exit downwards of the pump unit
The point of this discussion is 70 a bodies, so essentially I think all A's are the same except for the second row numbers which could be a date stamp thing. thats my guess
also i got wondering... I hope we arent talking about the foot pumps...