A pearl pocket penknife with a steel blade marked JO and stamped with a small crown. The maker is uncertain as the only cutler a google search came up with is Joseph Jonas a Sheffield cutler and later Lord Mayor of Sheffield. He joined Robert Colver and by 1878 the firm was known as Jonas & Colver.
A nice feature is the silver stepped and cross hatched spring cover -identical to those found on datable silver bladed folding fruit knives which would date it to circa c1870.
The pearl is in excellent condition and the spring action sound ie. the blade doesn't flop! The blade might be a little short as it doesn't fill the entire space for it in the handle but it doesn't look like it has been reshaped or damaged.
8cm long
11.5cm open.
Stock no. LK38