Bay 104 Wide lens shade for 55mm PCS and 50mm f/2.8 lenses (used)
These are getting really rare - I haven't had one on my site for years now. They have a press in brass adapter ring that fits onto the 104 bayonet and accepts 95mm filters. If you want to use filters on the 55mm PCS lens, you need this shade. Will also fit the 50/2.8 lenses. The ring presses into and out of the rubber in case you want to just use the adapter ring.
Condition of this item is good, but shows a fair amount of brassing on the mount and cosmetic wear. Filter threads are usable but may have either dirt or corrosion on them.