GM A.I.R. Smog Pump Pulley - $15 (Kingman AZ)

GM A.
I.
R.
Smog Pump Pulley Original GM A.
I.
R.
pump pulley.
Referred also as a smog pump pulley.
Powdercoated a flat black.
Has a few minor nicks around the outer edge which should be visible in photo.
Has not been used since being powdercoated and has been in storage for many years.
I believe it was removed from a 60's to early 70's GM engine.
The only stamping I can find on the pulley is S1 and FRONT.
Measures approx.
5-5/8" diameter.
It is possible any other numbers are so faint the powdercoat covered them.