Yes, it is an original Pentium.
On the AWARD 4.51(PG) BIOSes, the Socket 7 Pentiums were denoted as PENTIUM-S.
Other BIOSes, such as AMI, did not have this.
The "-S" on AWARD BIOSes indicates that the Pentium processor has power saving features. Eventually very late revisions of the AWARD BIOSes got rid of this, and was gone by the time of the Pentium II.
Pentium Pro AWARD BIOSes still show PENTIUM PRO-S for many boards.