OK, I cracked mine open. It is surprisingly well built. It's powered by three supplied button batteries. The outer shell is held together with three screws, two of which are under the gray plastic sleeve, which slides off of the wide end of the unit. Internally, there are ten (!) very small jeweler Phillips screws that hold the circuit board in place.
Visible on top are two capacitors and what appears to be a 3.579 xtal, possibly 83.579, or B3.579. The smartcard contacts are made from bent copper traces in a plastic module, and include a contact/insertion switch of similar design.
Turning the board over, there are numerous SMD resistors and diodes, and two 16-pin ICs, one 14-pin IC and a small 4(?)-pin IC/module, actually 3 pins and a tab.
The first 16-pin is labeled HCF4053 and 900028 and appears to be a Signetics part (if I remember the symbol correctly).
The second 16-pin is labeled HC595A, and PIA023 and is a Motorola part.
The 14-pin is labeled 01AV45M and HC00 and is a TI part.
The small 4-pin part is labeled HT1050 and looks like it might be a transistor or regulator.
I haven't done hardware in many years, so I'll have to go poking around on the net to find out what these parts are.
In answer to an earlier query, it comes with an attached cable and D-9 serial connector.