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Piano Forums at UK Piano Page, feel free to read the posts on our piano forums. If you wish to reply to a post or submit a new post you must register first, it's free.
Please read the Piano Forum FAQ for more details. Also, read the piano FAQ for common questions on pianos Please don't ask us to place a value on your piano as an on site inspection is required. Contact you local piano tuner who will be more than happy to help.
If there are exhibition medals illustrated on the piano, these might be dated 1885, 1889 or 1891, and the piano would have been made after the last one shown, as described at
I might be able to tell you more if you could post photos to show what the whole piano looks like, or email them to me to post.
Most Otto pianos are from about 1890-1910, so have a look at the general information at
Otherwise, the best hope is to ask your tuner to remove the action (the working parts of the notes) and look for the action makers' name and number.