Cisco SF100D-05

"Manufactured for CISCO", "SF-100D-05", and "PCB MADE IN CHINA" is silkscreened
 * on one SF100D-05's board (SN: PSJ1622032C, SD205T V01, 1147 date code).

The switch IC (QFP, possibly an RTL chip) is covered with a presumably epoxied heatsink.