This is a picture of 4 insulators made in England, for use in Uruguay

Left to right, they are marked C del E, SILVERTOWN, the unembossed Pilkington CD 436, and " British Made " I also have numerous other brown Cordeaux style insulators by Bullers of England, made for use in Uruguay, and several others by Bullers for use in Argentina.

Both of these countries contracted with the British to build and operate their railways up until 1948. True to the British Colonial system, they also purchased all related rail and telegraph materials from Britain, and brought them over on British ships, which in turn further stimulated the British economy.. Often, the insulators were used as ballast on some of the earliest ships.

The French and Germans also were in the "Railroading" business, but got into it way behind the British, and never caught up, but this would help to explain the finding of Isorex insulators in both Argentina and Uruguay, and various German made insulators as well. Germany was a "player" in Afganistan in the 1800's and early 1900's for railroading and bridge building.

Some of the German designed and built bridges were not the usual German success, as outlined in James Michner's 1963 book called "Caravans" which portrays life in Afganistan in 1946. BTW, it is a great read, and little has changed.