Raytheon RC4558N - general-purpose opamp : weekend die-shot

Raytheon RC4558N is a dual general-purpose opamp similar to μA741 with a slight taste of freedom. Packaged in plastic DIP.
Die size 1123x1094 µm.

LM747CN - dual general purpose opamp : weekend die-shot

This dual opamp LM747CN had datecode 8852. Manufacturer is unclear. While some 747 designs mention that "two amplifiers share a common bias network" - here we see 2 independent identical mirrored opamps.
Die size 1545x987 µm.

MN3102 - RC oscillator and 2-phase BBD driver : weekend die-shot

MN3102 is a dedicated IC which generates a 2-phase low-impedance clock which frequency is set by external RC components. It is designed to drive MN3207 and similar BBD's (bucket-brigade device).
Die size 1491x1391 µm.

MN3207 - 1024 stage analog delay line (BBD) : weekend die-shot

MN3207 is an BBD - bucket-brigade device (predecessor of CCD) with 1024 stages used as analog delay line.
Die size 2770x3210 µm.

Ti LMC555CMX - CMOS 555 : weekend die-shot

This Texas Instruments LMC555CMX is almost identical to National Semiconductor LMC555.
Die size 1136x1085 µm.

Fake audio opamp - Ti NE5532 remarked as AD OP275 : weekend die-shot

This was a weird one. After de-capping Analog Devices OP275 from audio opamp assortment kit I was surprised to see familiar Ti NE5532 die. As it was quite unusual, I de-capped original Ti NE5532 (directly from their e-shop) to confirm that older photo was indeed from genuine part, as well as one more fake OP275 to confirm that there was no mistake.

It looks like someone remarked Ti NE5532 as Analog Devices OP275. Die attach and properties of plastic package also suggest Ti origin of this part.

ST TSU104IPT - nanopower rail-to-rail opamp : weekend die-shot

ST TSU104IPT - is an extremely low power (580nA per channel) CMOS rail-to-rail quad opamp which could work from 1.5V source.
Gain bandwidth is only 8 kHz though. Die size 1123x1219 µm.