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Yes I saw that page - without a serial number we may never know.The piano is long since gone, but this helps us place it into a LIKELY century!

Good guidance! I found this on the Steinway patent numbers site: While the year numbers are hard to read, the photo is legible enough to see it says "June 13" and "Aug 1"... so: C.F. Theodor Steinway "Improvement in Piano-Fortes"; nose bolt having removable nut Jun 13, ...

Thanks, yes I understand that. But certainly if these are numbers of patents it will be AFTER that year for certain, and possibly the casting changed to LATER patent years at some point? I have no idea, just thought someone may know if so... or if these patent numbers disappear at some time. Thanks ...

Unfortunately, we can't see any serial number in the photo. I suppose these would be Patent numbers then... maybe that will narrow it down a little.

I have a rough photo showing the frame/harp of an old Steinway grand. On the front edge (near the keyboard) of the frame are two cast numbers - one above the other. Both are definitely part of the casting, not added later. It's hard to read, but it seems to be two dates - both 1877. Is this a good r...