These are factory seconds, which means that they have surface markings and some scratches, but other than that they work perfectly. They do not come in a box and are marked as seconds.
The MOD54 Mk27 is the latest version of this insert for the Paterson 3 reel tank.
It allows you to process 6 sheets of 4x5" large format film.
The Mk27 version is a total reworking of all previous models.
The new design is very robust, with nibs to help loading.
