Not super rare, its harder to find info on the rifles that fired it than on the ammo. This came from a box of 20 dad has had since the 60's. All of it came from Dad, its stuff that made its way home from the bank when he worked there in the 60's. Said he had a Webley or a .32 ACP in his desk at all times. Guns were provided by the bank, you picked what you wanted out of the pile and the supervisor took you out back and you blasted away until he was convinced you knew how to use it.