cheap plastic f=50mm 1:4 made in GERMANY
came with 600
3 blade system makes funny opening when at 16
poor click stops
numbers illuminated

compare to

Beslor 1:4
standard on 67
5 blades blades flex when pushed past 16
better click stops

EL-NIKKOR # 367755 1:4
8 blades consistent shape through range
firm smooth positive click stops

as far as actual results...
the nikkor was slightly darker
everything else looked the same