I worked at a small town True Value from 1988 to 1992 and was around as an auto mechanic right across the street until 1995. In 1988 I bought my first MM sockets in 1/4, 3/8 and 1/2 sizes with my employee discount. They were the red tin boxes. The inside lid has the graphic with the Indy Car (CART or USAC back then) in the red / white / blue banner. They were 12 point and made in Taiwan. I still have them.
Through that four year period I added metric sockets and deep wells. They were all on clip rails, except the 1/2 drive SAE deeps. Those were also in the tin box with the Indy Car sticker. All were Taiwan, except the rail of 1/2 drive metric sockets with no CCO.
The open stock was USA made during that time. I added extensions, breaker bars, a flex head ratchet and various one off sockets that weren't in the original sets. They were all USA made. Seems like the Danaher stuff of the last decade -- same design regardless of COO, the difference was sets versus open stock. I shelled the 1/4 and 3/8 ratchets once or twice by the mid 90's. Replaced with the same design but USA COO. They were warrantied with no hassle. I found them comparable to Craftsman of the day but since they were local rather than the next town over it was better for warranty.
I also bought combination wrenches in the same time frame. There were the non polished style. Looks like today's Husky. At that time frame, the wrenches no longer had that look of the Esco design, with the long tear drop logo shape. But the OEM supplier must have transitioned away from Easco not too much earlier. The store had opened in '86 and we still had open stock MM wrenches of the Easco design. The sets and open stock were Taiwan made in the late 80's but by the mid 90's the open stock was USA made. I still have those sets all Taiwan made, except where I lost a wrench and replaced it with USA made of the same style. I never broke one, including pounding on them and doubling them up. The Taiwan wrenches said "Master Mechanic" in print but the USA made wrenches had the stylized girder "Master Mechanic" logo.
Around 90 or 91, MM came out with the "Fiber Steel" ratchet. It was a plastic encased fine tooth ratchet. Sort of a pear head design with a flatter handle. These sets were still in the red tin boxes. The lid decal changed to all red with the stylized girder log. Sets include both metric and SAE sets, six point (yeah). Taiwan made. I loved these ratchets. Great in cold weather. I still have the 3/8 set. It's complete. I lost the 1/2 drive ratchet around 1993 or 1994. I have the 1/4 set, but the ratchet got shelled in the late 90's and by that time they didn't make the ratchet any more. I got it warrantied, but it was the old round head design. USA made though. (The sad part is that ratchet was shucked for a while and the local TV store had this lone fiber steel ratchet in stock -- but by the time I took the ratchet in the lone unit was sold.)
MM screwdrivers were all USA made. In the late '80's these were red/clear handles, but by the mid 90's they were black/clear. I have a mix of both. Some of the red were warrantied and some of it was filling out sets. Very comparable to the Craftsman of today, but the handle designs were and still are different.
We also had the Enders brand. There were no sets, just open stock. I always envisioned building out sets of punches and screw drivers in Enders. But it never went on sale and the MM specials caught my dollars. The guys that knew Enders though -- they would come in and pay the price.
I have MM tool boxes. In the late 80's they were Homak. By the mid 90's they were Waterloo. Pretty interchangeable with Craftsman of the day. These boxes took a beating when I worked in the trades, but are still superior to anything home grade today.
The MM socket sets are still my "go to" I have in filled them with some 6 point USA Craftsman from the 1990's and I have full sets of 3/8 Proto (2 sets) and SK that I have picked over time. Plus sets if 1/4 and 1/2 of name brands. All USA made. But my original MM tools are still complete. They are the sets I made my living with.
Same said with my MM wrenches. I have a full rail or Proto's, USA Huskies, roughly 2 sets of mixed USA brands. I have full sets of SAE and Metric USA Craftsman gear drives (before they went overseas and the price dropped to equal gear wrench). But those 25 year old MM's are still my go to -- a mix of nostalgia and that they do the job.