This is a high-quality photodiode (looks like gold plated) in a TO-18 metal case. It marked as OP272 (Optek?). N further information available.
This is a surplus product. It was obtained from a surplus store, from an inventory or from any other secondary source. You can expect this product to be in good working condition, but it can show signs of being handled, shipped, repackaged etc. The supply of a surplus article can suddenly run out, or the price can change. Get it while it is available.