Nikon F Finder Release Collars (Part 20FB1-2129)
Finder Release Collar Type 1
The chrome collar has no horizontal slot.
Recorded body numbers between 6400492 and 6952049.
Finder Release Collar Type 2
The chrome collar is horizontally slotted to allow release by fingernail pressure.
Recorded body numbers between 6948799 and 7450960.
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