My new office phone - WE5304

[poplar1]

5302 and 5304 sets kept the same letter suffixes that were assigned to the 300 series:

         ORIGINAL SET:                                       CONVERSION:
302A (manual, 2-conductor mounting cord)
302B (5HA dial,2-conductor mounting cord)
302C (5HB dial, 2-conductor mtg. cord)
302D (5HE dial, 2-conductor mtg. cord)

302E (manual, 3-conductor mtg. cord) ----------> 5302E (manual)
302F (5HA dial, 3-cond.)
302G (5HB or 6A dial, 3-cond)-------------------> 5302G (5M OR 6H dial)

304A (manual)
304B (5HA dial)
304C (5HB dial or 6A dial)------------------------> 5304C (5M or 6H dial)
304D (5HE dial)
-------------------------------------------------------------------------------
5HA dial has all numbers
5HB and 6A have numbers and letters
5HE has numbers + J, M, R, W
5M and 6H have 164C number plate same color as phone, with dots

[poplar1]

If the housing is stamped Bell System, the 1949 plastic 304C, property of one of the Bell companies, was probably converted to a 5304C in 1961 at the Western Electric Distributing House (Service Center), then leased to another subscriber.

[Slal]

Yes, "Bell System made by Western Electric" on 'housing' if that's preferred term.  (Also marked on F1 handset that came with it fwiw.)

Anyway, thanks everyone, for all the information & diagrams for it.  Correctly wiring handset also a big plus.  ; )

Best

--Bruce