I had multiple MoBos, i think i had around 5 80486 motherboards before i scraped them for some cash. I wasnt into a retro rig back than.
They were pretty good models from what i remember.
The one i have now is the CH-471B.
http://motherboards.mbarron.net/models/486vlb2/ch471b.html
I used to find 80386 80286 motherboards, even some incomplete motherboards with Motorola processors. Didn't know much about them so i didn't buy any of it (3$ per kg of electronics).
I even have some older components and chips, among who is an alu cased IBM 386, 487DX25 80286-10, sharp LH0080, various Zilogs, and so on. Some unknown gold caped chips AD565AJD...
And i don't know how to check the production date.
Also as a kid i used to go to various electronics dumps and i remember there being a ton of old tech. Too bad i knew nothing of them than, used to bash em with a rock. Now the thought hunts me every day 😀
Note | LLSID | "Big boobs are important!"