This is an Axial Racing AS-2 servo. The AS-2 is a rebranded Futaba S3010 and will accept replacement parts for the S3010. This has seen light use and is in very good condition.
Specs:
Speed: 0.20 sec/60� @ 4.8V, 0.16 sec/60� @ 6.0V
Torque: 72 oz-in (5.2 kg-cm) @ 4.8V and 90 oz-in (6.5 kg-cm) @ 6V
Dimensions: 1.6 x 0.8 x 1.5" (1-9/16 x 13/16 x 1-1/2") (40 x 20 x 38mm)
Weight: 1.5oz (1-7/16oz) (41g)