It is a Soundscriber Disc and will play back with a microgroove stylus.
I have worked with many of them over the years.
Belfer Audio Archive
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>>> [log in to unmask] 7/17/2007 4:19 PM >>>
Richard Warren wrote:
> Dear Barbara Need,
> If the disc is translucent green vinyl, it may be a Soundscriber
> These were 33.3 rpm microgroove, so you should try to play it as if
> were an LP. Pray that it hasn't warped; if it has, you may need to
> it to someone with excellent equipment and much experience.
> Sincerely, Richard
> At 02:59 PM 7/17/2007, you wrote:
>> I have been asked to get a digital transfer from what I believe to
>> a "Flexi disc" (thin green plastic /vinyl disc with a square hole).
>> The only complication is that, as far as I can tell, these were LPs
>> and, therefore, no earlier than 1948. The date on the disc, however,
>> is '43. We have an osmium stylus (which we use for 78s) and a
>> stylus (which we use for LPs). What stylus should I use for
>> (And if you have recommendations for adding to my stylus supply, I
>> would welcome that as well, though I may not be able to do anything
>> about it just yet.)
>> Barbara Need
I've seen very thin flexible orange and yellow discs which were used
disc recorders in the 40s..don't know why this one would have a square
unless the original hole was too tight and someone has enlarged it. If
of these home cuts, it would probably play at 78. Does it look like a
product with a printed "label" or might it be a home cut?