The couple of combination squares I bought off e-bay have shown up recently. The first pic is 3 Stanley's. Top is a Stanley No. 22, which has a cast iron head and has two level bubbles, which is pretty unique. The 22 was made from 1941 to 1974. I think this one dates to the 1940s or so.
The next one is a Stanley 122, which was their standard combination square. Cast iron head and made 1941 to 1984. I think this will be my new go-to square. I cleaned it up, and made it square. Feels very good in the hand.
The bottom one is Stanley 122A. It has an aluminum head, and not sure when this one was made - I think in the 1980s-early 90s. All 3 of these are made in the USA. This is a very good square.
The next two are a Stanley No. 21 with Sweetheart logo. Stanley made the No. 21 from 1911 to 1984. This is a 9 inch version, and the Sweetheart logo dates this one from 1920 to 1935.
Also shown is a 6 inch Johnson (

) I bought this one new from Amazon a couple of years ago and it is very handy. I couldn't see the stamped numbers very well, so I spray painted the rule and then sanded it down to darken the numbers. That helped a lot. This one of my go-to small square. Made in USA.
Lastly are 3 cheap ones from Harbor Freight. The 12 inch Pittsburgh is acceptable. The 6 inch is terrible. The other one I only use the center finder for finding center for lathe turnings.
I have spent about 10 or 15 minutes on each one of these just getting them adjusted to be square. All are square except the little Pittsburgh - it's just too wonky.
Sorry to expound on combination squares so much - but I have used them all my life, and most of the time they have been woefully un-square. Which makes for frustrating wood-working projects. In my old age, I finally learned how to spend a few minutes and square them up. It makes the work so much more enjoyable when everything fits together like it should!