New Unknown TRW 8-Pin Dip Resistors, Marked: 4SI.5K Ohm G, Military Surplus, Part Number C08-3.  Each bid quantity is for a Lot of Twenty (20) Pieces.  You may bid / buy any number of lots, up to the total quantity available above.

These were purchased with a bunch of other items at a military sale many years ago, and they were brand new in the original factory bags.  We packaged them in heavy Ziplok bags for resale.  No datasheet or other information on what they were used for.