Don't know if you guys have ever tried this site Colourise SG (
https://colourise.sg/#colorize). You upload a B&W pic, and
in a matter of 4-5 seconds you get it colorized. Of course, you don't get nice results 100% of the time, but some are really outstanding. I've tested a lot of pics, and came with this conclusion: not that good for individual photos, or pics from the 1950 up era. But for team pics from around the turn of 1900, some results were truly fascinating. Quick, easy, and fun. Of course, you'll note that sometimes some parts (hands,..) are still grey, but getting it in 4-5 seconds, and for a group pic, well, ...
Here are some tests I've made.
WARNING: I have to admit that I'm not sure that the jersey's colors of these old teams are OK.