The Morse 4300 typically uses a standard 15 watt screw in style sewing bulb. Just like the one shown in the enclosed link. However, due to the age of this machine, it is possible that the light fixture has been changed at some point. If you have a burned out bulb, and it has a screw style base, this one will be right. There is also a push in style used on many aftermarket fixtures. Both styles of bulb are fairly universal though. So it will be one or the other.
Light Bulb 15 Watt Screw In 7SCW
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