Two rarely found Series 8 filters with thread for your Hasselblad SWC (C-lens) or the like so you can mount the hood directly on it. 67mm is considered as a temp. solution as you can only make around half turn on the lens without damage.
The dark green one is new in box with manual. The clear filter is marked "Mist-maker" but it is a normal clear one propely because it is hard to find a series 8 filter with thread like this and has been converted from a 67mm.