<s>
The	O
Nikon	B-Algorithm
S4	I-Algorithm
is	O
a	O
rangefinder	O
camera	O
produced	O
by	O
Nikon	B-Algorithm
that	O
was	O
very	O
similar	O
to	O
the	O
Nikon	B-Algorithm
S3	I-Algorithm
but	O
had	O
a	O
slightly	O
lower	O
price	O
.	O
</s>
<s>
The	O
camera	O
had	O
a	O
short	O
production	O
run	O
of	O
less	O
than	O
6,000	O
units	O
from	O
1958	O
to	O
1960	O
which	O
makes	O
it	O
rare	O
compared	O
to	O
the	O
other	O
Nikon	B-Algorithm
rangefinders	O
;	O
however	O
not	O
as	O
rare	O
as	O
the	O
Nikon	B-Algorithm
1	O
or	O
Nikon	B-Algorithm
M	O
models	O
.	O
</s>
<s>
The	O
Nikon	B-Algorithm
S4	I-Algorithm
was	O
not	O
exported	O
to	O
the	O
United	O
States	O
.	O
</s>
