For a list of all currently documented Atheros chipsets with specifications, see Atheros.
11a/b/g Wireless PC Card with XJACK Antenna
"PCA-100AG_V01A" and "ENG-002-7601" is silkscreened on the board in the FCC photos. A label with a MAC (00904B2742EE, Gemtek OUI) is also affixed to the opposite side in the same photos.
lspci -nnv dump
06:00.0 Ethernet controller : 3Com Corporation 3CRPAG175 Wireless PC Card [a727:0013] (rev 01) Subsystem: 3Com Corporation Device [10b7:1026] Flags: bus master, medium devsel, latency 168, IRQ 19 Memory at f1d00000 (32-bit, non-prefetchable) [size=64K] Capabilities:  Power Management version 2 Kernel driver in use: ath5k
ath5k info dump
ath: EEPROM regdomain: 0x60 ath: EEPROM indicates we should expect a direct regpair map ath: Country alpha2 being used: 00 ath: Regpair used: 0x60 ath5k: phy5: Atheros AR5212 chip found (MAC: 0x56, PHY: 0x41) ath5k: phy5: RF5111 5GHz radio found (0x17) ath5k: phy5: RF2111 2GHz radio found (0x23) cfg80211: Calling CRDA for country: US