The only reference to creating Magic Items in the 1974 edition of Dungeons & Dragons is found on page 6 and 7 of Volume I (Men & Magic). In there it says
Wizards and above may manufacture for their own use (or for sale) such items as potions, scrolls, and just about anything else magical.Looking at the level chart on page 16 of Volume I we see that the title "Wizard" refers to a 11th level magic user.
There it was made into a 6th level spell which can be cast by a 12th level wizard. In addition the 8th level permanency spell has been altered to make it a requirement for the creation of permanent magic items. This meant that in AD&D, compared to OD&D, the level of making permanent magic items has been increased from 11th level to 16th level.
Wow Gygax must not have liked 11th level character making magic items.
Also this means Enchant Item in Swords & Wizardry is an imported AD&Dism. I am thinking for the Book of Lost Magic of dropping this down a fifth level spell. So that 9th level wizards can create magic items. This fits better with how often magic item appear in the Majestic Wilderlands. And I will revise the minor Magic Item creation spells I introduced to the Majestic Wilderland Supplement to the following
Create Scroll 1st Level spell (unchanged)
Create Potion 2nd level spell (unchanged)
Create Charm 3rd level spell (dropped from 4th level)
Create Wand 4th level spell (dropped from 5th level)
Enchant Magic Item 5th level spell (dropped from 6th level)
Create Teleport Circle (dropped from 6th level)