Vintage NOS Stewart Warner Oil Pressure Gauge Crescent Needle Curved Glass Lens. New old stock Stewart Warner Oil Pressure gauge. Model number 691-J. Part number 6620-528-8270. The box is dated 6/60. The wrapper is dated November 1959. This is the real deal, with large diameter smooth bezel Stewart Warner gauge with a curved glass lens and cresent moon needle. Does not get better than this. The box is double sealed and never been opened. 2 5/8 SIZE Under the dark green paint is shiny stainless steel. To remove it if you want takes about 5 minutes with some acetone/nail polish remover with a buffing pad.