Telmaco Portable Model P1 old

• Brand: Telmaco

One dial (primary tuning control knob) Acme Reflex circuit.

The well known book "1921-1932 Radio Collector's Guide" by Morgan E. McMahon lists on page 171 for Telephone Maintenance Co. (Telmaco) the following models: 1921: TRD-1 (no price); 1923: Telmaco (Reg. for $ 25 and we assume model B-R), followed by 6 models P-1:
1924: Telmaco Acme P-1 (we call it "old" for distinction to the "new" Acme portable);
1925: Acme P-1 ("new" Portable) for $ 125, P-1 ("old" Portable) for $ 147, P-1 (Kit "old") for $ 85;
1926: P-1 ("new" Portable) for $ 125 and P-1 (Kit, "new") for $ 80.
All these models with P-1 are shown as Reflex with 3-3 stages and one "Big tuning dial" and four tubes for batteries. It may well be that in this entry there are errors, for instance no distinction between model "old" or "new" or both kits are the same, but as a reference work (not a catalog!) we have to show all of them and to explain.

In questo link sono elencati 16 modelli, di cui 13 con immagini e 0 con schemi.
Elenco delle radio e altri apparecchi della Telephone Maintenance Co.; Chicago, Illinois (Telmaco)