The tropical version of the Carbine dates back to around 1922 when Butcher advertised a tropical version of the No. 6 (for 2 ¼" x 3 ¼" images). This was finished in black crystalline paint with Russia leather bellows.

By 1925 the finish was the familiar oxidised brass. This model had a choice of a 3 speed shutter or a Compur both with an Aldis lens.

In 1926 the No. 12 Watch Pocket Carbine (2 ½" x 4 ¼") was added, this had teak side panels with a brass front shell and back. Ross and Zeiss lenses were available for both sizes. The finish at this point was described as 'copper oxidised Florentine bronze'.

In 1927 the No. 4 was added, this was a cheaper version of the No. 6 and was fitted with a 3 speed shutter. The No. 6 continued with a Compur shutter as did the No. 12.

By 1930 the No. 6 was designated No. 7. The other two models remaining as before. The No. 7 survived until the late 1930s (renamed Tropical-Ensign-20 around 1936). The other two models ceased in the early 1930s. The No. 6 model (and No. 7) was available with a plate back to which could be fitted single metal slides, film pack adapters and a focusing screen.