Hi,
Sorrie Kerrie, but you were out by 200 years! The telescope is after all only 400 years old back to Galileo!
John Ottway started his company in 1840
The first address being 10 King St, Holborn, where they were for 2 years.
Second address 11 Devonshir(e) St. Queens Square from 1842-1847
Third address 21 Packenham St. Gray's Inn Rd. from 1853-1858
Fourth address 83 St John Street Rd. from 1859-1867
Lastly 178 St. John Street Rd. from 1868-1870
His son then joined the firm and they became John Ottway & Son and remained at the last address from 1871 - 1900+
The scope you have is early WWII and was used for sighting in light artillery. I couldn't tell you what kind of canon it would have been on, but I have a similar one on loan for a bit of work at the moment from a mate of mine.
Hope this helps!