This is the JR Sport ST47 Standard Servo.  This has a universal connector that works with JR, Hitec, Futaba, and Airtronics.

Specifications:
Size Category: Standard
Type: Analog
Torque: 47 oz/in @ 4.8V
Speed: .24/60 @ 4.8v, .19/60 @ 6v
Dimensions (WxLxH): 0.73 x 1.52 x 1.32
Weight: 1.55 oz
Bushing Or Bearing: Bushing
Gear Type: Nylon
Application: .40- to .90-size Aircraft