8056.5khz. This is a relatively standard shift of approximately 380 hz., conventional FSK. Two stations were trading traffic in this mode, each taking turns sending.  The ACF was 160. Copy was not particularly good.
    The only other identified 125 baud signal that would be similar is ARS-ARQ. I have heard this system numerous times, and the shift is 170-200hz. and the ACF is not 160, as with this signal. .

• Here's a 122k wav file of the signal, mono 8 bit.

• Here's a 256k file of the signal, in Code30 RTS format.