The lettering on the bottom varies, and some are cut-out and some are solid. It may be that the type 2 cut out base was followed by the type 2 solid base (as in the Style 6 Big Ben), we'll have to get more data to find out.
Base 1, 1A
Base 1, 1A
Base 1, 2A
Base 1, 2A
Base 1:
61V. Small lettering (about 1.8 mm tall), 2 holes in base, riveted to bezel. 1A or 2A. Solid base only. ca. 1949 - 1951.
61 V
Base 2, cut-out, 1A
Base 2, cut-out, 1A
Base 2, cut-out, 2A
Base 2, cut-out, 2A
Base 2, cut-out, 2A
Base 2 Cut-out:
61V. Large lettering (about 2.7 mm tall). Cut-out base. 1A or 2A. 1951 to 1956. (Possibly mid-1951 to mid-1953.)
61 V
Base 2, solid, 1A
Base 2, solid, 1A
Base 2, solid, 2A
Base 2, solid, 2A
Base 2 Solid:
61V. Large lettering (about 2.7 mm tall). Solid base. 1A or 2A. 1951 to 1956. (Possibly mid-1953 to 1956.)
61 V
Base 3, 5A
Base 3, 5A
Base 3, 6A
Base 3, 6A
Base 3:
61-V (notice the dash) in large lettering, two radial lines on base. 5 A or 6 A cavity number.
61-V
Base 4, 2
Base 4, 2
Base 4, 3
Base 4, 3
Base 4, 4
Base 4, 4
Base 4, 7
Bases 4, 7
Base 4:
61-V, "NMP" in an oval to the left, base spot welded to the bezel. Cavity numbers up to 7, located at the upper right, have been seen. Used ca. 1956.
