Here is a pair of standard 32MB SIMMs with parity, making an upgrade of 64MB in many mid-to-late 1990s systems, including 486s, Power Macs, Pentiums and Pentium Pros..
These were made by Digital Equipment Corporation (DEC), with their part number 54-21277-BA
Each double-sided SIMM has eight 16 megabit Hyundai chips plus four Mitsubishi chips on each side. All chips are rated at 60ns. If your system (like a PowerMac 6100) does not require those extra parity chips, it will most likely ignore them.
If you are not sure whether these are compatible with your system, please ask me before ordering. I would rather tell you "no, these won't work" and give you a reason instead of having both of us waste time with a return which could have been avoided.
Buyer will receive the exact two SIMMs pictured here.
I offer a 30 day return privilege and free ground shipping to any U.S. zip code.