Well, I think that's a rather nice antique piano you have there, because according to http://www.total-piano-care.com/hobart-m-cable-pianos.html the Hobart M Cable #20371 piano looks to be one of the earlier ones, possibly from 1926.
Obviously, Hobart M Cable pianos are amongst the finest and have always been a top quality, all American brand.
The company was established back in 1900 and manufactured pianos in the USA for 65 years.
What is distinctive about this brand of piano is that they are soulful with pure tone qualities yet so very powerful!
Today, the brand is owned by the America Sejung Corp. But luckily the name of Hobart M Cable has been retained along with all the characteristics that make it popular with pianists and audiences alike.
I hope the link helps, let me know if you agree with me about the date of manufacture for your particular model. The serial numbers are rather confusing so, please excuse me if I have misread the information.