I got this Stanley No 4 smoothing plane for $20, first No 4 I bought. I tuned it up and it smooths and makes nice shavings. As near as I can tell, it is over 100 years old – says Stanley on the lateral adjustment lever, no throat adjustment screw for the frog. The frog sits only on three machined ribs. Has the number 2 cast behind the frog.
That’s pretty amazing that a tool so old can still do good work.