Two types of lettering were used on the bottom, and the second type was first made with a cutout, and later made solid. (Applies to both Style 6 Chime Alarm and Style 6 Loud Alarm.)
Big 6 Loud Base 1 "2 A" – Version 2
Big 6 Loud Base 1 "2 A"
Base 1:
Cavity number "1 A" or "2 A" with "48 ∙ H". Note the dot between "48" and "H". Used until ca. mid-1951.
1 A [2 A] 48 ∙ H
Big 6 Loud Base 2 "1 A" (Cut Out) – Version 2. Cut Out
Big 6 Loud Base 2 "1 A" (Cut Out). Cut Out
Big 6 Loud Base 2 "1 A" (Cut Out). Cut Out
Base 2:
Cavity number "1 A" or "2 A" with "4 8 H". Note there is no dot between "4 8" and "H", there is a space between "4" and "8" and there is a wide space between "8" and "H". There is a curved cutout in the front half of the base (to save on material??) Used ca. mid-1951 to mid-1953.
1 A [2 A] 4 8 H
Big 6 Loud Base 3 "1 A" (Solid). Solid
Big 6 Loud Base 3 "1 A" (Solid). Solid
Big 6 Loud Base 3 "1 A" (Solid). Solid
Base 3:
Cavity number "1 A" or "2 A" with "4 8 H". Note there is no dot between "4 8" and "H", there is a space between "4" and "8" and there is a wide space between "8" and "H". The base is SOLID (no cutout). Used ca. mid-1953 on.
