Sheldon and John figured out the proper NSN which eventually led me to the NSA supply catalog which verified it is indeed 0.5” wide. 

It is not listed as teletypewriter perforator tape like our usual stuff, but as teletypewriter recorder tape, presumably for printing only. The NSA supply catalog also lists 3/8” recorder tape which several crypto machines used.  I’m going to ask on the crypto list if anyone recognizes a use for 1/2” tape.

Nick

On Tue, Oct 26, 2021 at 8:25 AM John <john-koster@tx.rr.com> wrote:
This isn't too helpful:

https://www.iso-group.com/NSN/7530-00-577-4681


On 10/26/2021 7:04 AM, Nick England wrote:
> The box says 1/2 wide. That’s what got me wondering.
>
> On Mon, Oct 25, 2021 at 5:20 PM John <john-koster@tx.rr.com
> <mailto:john-koster@tx.rr.com>> wrote:
>
>     The third picture looks more like it's 7/8" to me. It would have
>     been clearer if he'd not used the end of the tape.
>
>     John, W9DDD
>
>
>     On Oct 25, 2021, at 4:07 PM, Sheldon Daitch via GreenKeys
>     <greenkeys@mailman.qth.net <mailto:greenkeys@mailman.qth.net>> wrote:
>
>>     It could be 7530-577-4681, as 7530 is Stationery and Record Forms.
>>
>>     73
>>
>>     Sheldon
>>
>>
>>     On Monday, October 25, 2021, 03:36:51 PM EDT, Duncan Brown
>>     <duncanancy@earthlink.net <mailto:duncanancy@earthlink.net>> wrote:
>>
>>
>>     My first thought was for some sort of Morse register, but the
>>     package
>>     label says "Tape, Teletypewriter".
>>
>>     Too bad we can't see the first digit of the Federal Stock Code.
>>     I tried
>>     searching for what was there, but couldn't find any thing.
>>
>>     FSC for teletypewriters would normally start with "5815-"
>>
>>     What did the early WU 2B printers start out with?
>>
>>     Duncan
>>     K2OEQ
>>
>>
>>     On 25-Oct-21 14:52, Nick England wrote:
>>     > What was this 1/2" wide tape used for?
>>     > https://www.ebay.com/itm/403254065206
>>     > I have seen 3/8 tape for tape printers and 15/32 for Wheatstone
>>     > perforators (and of course wider tape for 5-level perforators)
>>     >
>>     > Nick England K4NYW
>>     > www.navy-radio.com <http://www.navy-radio.com>
>>     <http://www.navy-radio.com>
>>     >
>>     > ______________________________________________________________
>>     > GreenKeys mailing list
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>>     > Post: mailto:GreenKeys@mailman.qth.net
>>     <mailto:GreenKeys@mailman.qth.net>
>>     >
>>     >>>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>>     https://teletype.net/gksearch
>>     >>>> 2002-to-present greenkeys archive:
>>     http://mailman.qth.net/pipermail/greenkeys/
>>     >>>> 1998-to-2001 greenkeys archive:
>>     http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>     >>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>>     http://comcents.com/tty/greenkeyssearch.html
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>>     <mailto:duncanancy@earthlink.net>
>>
>>
>>     ______________________________________________________________
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>>     Post: mailto:GreenKeys@mailman.qth.net
>>     <mailto:GreenKeys@mailman.qth.net>
>>
>>     >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>>     https://teletype.net/gksearch
>>     >>> 2002-to-present greenkeys archive:
>>     http://mailman.qth.net/pipermail/greenkeys/
>>     >>> 1998-to-2001 greenkeys archive:
>>     http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>     >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>>     http://comcents.com/tty/greenkeyssearch.html
>>
>>     This list hosted by: http://www.qsl.net
>>     Please help support this email list: http://www.qsl.net/donate.html
>>     Message delivered to sheldondaitch@yahoo.com
>>     <mailto:sheldondaitch@yahoo.com>
>>     ______________________________________________________________
>>     GreenKeys mailing list
>>     Home: http://mailman.qth.net/mailman/listinfo/greenkeys
>>     Help: http://mailman.qth.net/mmfaq.htm
>>     Post: mailto:GreenKeys@mailman.qth.net
>>
>>>>>     Jordan Spencer Cunningham's GreenKeys Search Tool:
>>>>>     https://teletype.net/gksearch
>>>>>     2002-to-present greenkeys archive:
>>>>>     http://mailman.qth.net/pipermail/greenkeys/
>>>>>     1998-to-2001 greenkeys archive:
>>>>>     http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>>>>     Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>>>>>     http://comcents.com/tty/greenkeyssearch.html
>>
>>     This list hosted by: http://www.qsl.net
>>     Please help support this email list: http://www.qsl.net/donate.html
>>     Message delivered to john-koster@tx.rr.com
>>     <mailto:john-koster@tx.rr.com>
>     ______________________________________________________________
>     GreenKeys mailing list
>     Home: http://mailman.qth.net/mailman/listinfo/greenkeys
>     Help: http://mailman.qth.net/mmfaq.htm
>     Post: mailto:GreenKeys@mailman.qth.net
>     <mailto:GreenKeys@mailman.qth.net>
>
>     >>> Jordan Spencer Cunningham's GreenKeys Search Tool:
>     https://teletype.net/gksearch
>     >>> 2002-to-present greenkeys archive:
>     http://mailman.qth.net/pipermail/greenkeys/
>     >>> 1998-to-2001 greenkeys archive:
>     http://mailman.qth.net/archive/greenkeys/greenkeys.html
>     >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
>     http://comcents.com/tty/greenkeyssearch.html
>
>     This list hosted by: http://www.qsl.net
>     Please help support this email list: http://www.qsl.net/donate.html
>     Message delivered to navy.radio@gmail.com
>     <mailto:navy.radio@gmail.com>
>
> --
> Nick England K4NYW
> www.navy-radio.com <http://www.navy-radio.com>

--

John Koster
john-koster@tx.rr.com

--
Nick England K4NYW
www.navy-radio.com