34852 is the 16 ohm 1", usually found in the 604E and earlier. Can be old or new style.
Two of my Es have the 34852, the other two 20275s.
35840, if I'm not mistaken, is the new style dia part number for the 23744 'light' dia, and was found in the early 902s.
This has most of the dia numbers
Altec HF & LF Cross-Reference Parts List
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