Base marks are from the dies in Anderson type bullet presses. Ludlow, Eley, Schlesinger, Pursall, the Royal Arsenal in Woolwich, and probably some others yet unknown all utilized engraved dies. The 1-9 numbers are from Woolwich and should not be considered American Civil War bullets although a few could have slipped through. As Mike has stated, these are recovered from British garrison sites. The reason being that the British government could not sell government stores to the South since acknowledging the Confederacy would be deemed an act of war against the Union. Only private companies (like those listed above) made sales.
The iron cup (or culot) is early Enfield production, like Crimean War vintage. It was found that the iron cup often shot right through the round and the boxwood plug was later adopted.