Map @ Mit5x: http://siliconpr0n.org/map/dec/57-19400-04/mcmaster_left_mz_mit5x/
Map @ Mit20x: http://siliconpr0n.org/map/dec/57-19400-04/mcmaster_left_mz_mit20x/
Markings
(Harris logo) D4-6901-5 DC336 71-17679-10 ?8523 1618-95
Markings (best guess anyway)
(harris logo) ???-5100 06334 71-17617-41 ?8527 1790?