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When Did Conn Stop Making Rolled Tone Holes?

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Short answer: 1947.

The 10M tenor
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Conn interoffice communication dated June 9, 1947 announcing the first 10M tenor saxophone without rolled sockets
Conn interoffice communication, June 9, 1947. Courtesy of Josh Creekmore, Saxquest and Saxophone.org.

This is a Conn interoffice communication dated June 9, 1947, that states that the first 10M without rolled toneholes is number 325028. We don’t know if 325027 was a tenor, so we don’t know the last one with rolled toneholes, only the first one without. This was from a collection of papers belonging to Bob Ziems.

The 6M alto
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For the alto, while we do not have a specific serial number (it is assumed it will be fairly close to the tenor serial), we do have- believe it or not- an actual Conn factory blueprint with a note.

Conn factory blueprint M-43124 for the 6M finished bow, with a change log entry reading REMOVED ROLLED TONE HOLES dated 4-25-47
C.G. Conn Ltd. drawing M-43124, “Bow - Finished,” 6M. Drawn 3-21-45 by K.D. Long. Courtesy of Ryan Lillywhite at Conn-Selmer.

Down in the change log at the bottom of the title block, in pencil:

REMOVED ROLLED TONE HOLES — 4-25-47

April 25, 1947. Happy rolled tone holes deletion day to those who celebrate.