I have details of two possible J Stevens from IGC:

1. Name J Stevens Arms & Tool Co
Address1 15 Grape Street
Address2 4 Cullum Street
City/Town London
Country United Kingdom
Trade Gun makers
Other Address
Dates 1910-1918
Notes
Established in 1910 at 15 Grape Street, the firm moved in 1916 to 4 Cullum Street. They ceased trading in 1918.

2. Name Joseph Stevens
Address1 11 Upper Priory
City/Town Birmingham
Country United Kingdom
Trade Gun maker
Other Address
Dates 1874-1880
Notes
See James Stevens at same address (1878?).
Name James Stevens
Address1 11 Upper Priory
City/Town Birmingham
Country United Kingdom
Trade Gun maker
Other Address
Dates 1878?
Notes
See Joseph Stevens at same address (1874-1880).

These two may have been one and the same.

Tim