Stanley 78 this time around. No patent dates and no marking other than the brand and model. Probably not very old. I saw this on e-bay a while back. All the parts, not much rust, and a buy-it-now price set below fair market value. So I snagged it up.
Upon receipt I gave it an inspection. Everything ship shape. Dull blade with a slight back bevel and no longer square may indicate a casual user as the previous owner. About 20 minutes on the granite slab with 120 and 220 grit paper cleaned and flattened the sole and sides. I left the slight hollow seen below. It would require a lot of sanding and I doubt it would improve performance by removing it.
Verdict: works great, ready for years of service
-- Doug, woodworking in Alabama