One of the first nine metal valves was the 6F6 output pentode, soon after the first 6L6 was produced and then the 6V6. Glass equivalents of these were manufactured in the US, Canada and Europe. Today these glass types are still made in China and Russia. The original metal types were never manufactured in Europe, though the US tubes were sometimes resold under British brands.
See also 13 Volt Valves
The first metal tubes