Correct, it is actually a Ceramic resonator, which is a cheaper version of a metal cased crystal. They build the capacitors inside to save on cost for mass produced items. I have got the SA-5 to run down as low as 5.8Mhz, but not found many resonators that go much higher than about 10Mhz. A common flavour is the 3.56Mhz type used in loads of toys from Furby's to Speak and Musics... 
Paul