[78-L] 1952 lacquer record question

[Malcolm]

Hello to whoever is left on this list!
I recently received a 1952 NBC Reference Recording #113 - a sound 
effects record. It's called "Buzzing Sound" and penned in below that is 
"Flying Saucers". It is a 78... BUT it looks to me as if it is meant to 
be played with a LP stylus. The grooves per inch are high and the groove 
itself is far thinner than that of a normal 78. Was this the case with 
other NBC instantaneous discs from the time? - I want to avoid damaging 
the recording by using a 2.7 mil 78 stylus if that is so. Thus my question.
Aloha,
Malcolm R