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DYY/EGH bulb 500 watt 120 volt. Fits Sawyers 707, 747AQ, many other slide projectors made by Sawyers and other such as Minolta, Nikkormat. Some bulbs of this designation look different. The base is the same but the bulb envelope is more rounded. Either type has the same performance.
Please compare the base of this bulb as pictured to the base of your old bulb. A very few Sawyers projectors use a different bulb with a 2-pin base and no center plug. Those projectors use a FBG/FBD bulb.