<s>
It	O
is	O
the	O
earliest	O
known	O
production	O
35mm	O
SLR	B-Algorithm
camera	I-Algorithm
ever	O
to	O
be	O
built	O
,	O
but	O
fewer	O
than	O
320	O
examples	O
were	O
made	O
.	O
</s>
<s>
The	O
actual	O
launch	O
date	O
of	O
the	O
"	O
Sport	O
"	O
is	O
somewhat	O
uncertain	O
,	O
however	O
it	O
was	O
in	O
series	O
production	O
by	O
1936	O
and	O
must	O
undoubtedly	O
be	O
one	O
of	O
the	O
two	O
earliest	O
generally	O
available	O
SLR	B-Algorithm
cameras	I-Algorithm
using	O
the	O
35mm	O
film	O
format	O
,	O
the	O
other	O
being	O
the	O
German	O
Ihagee	O
Kine	B-Algorithm
Exakta	I-Algorithm
,	O
launched	O
in	O
1936	O
.	O
</s>
<s>
It	O
was	O
manufactured	O
by	O
the	O
Soviet	O
camera	O
factory	O
Gosudarstvennyi	O
Optiko-Mekhanicheskii	O
Zavod	O
,	O
The	O
State	O
Optical-Mechanical	O
Factory	O
in	O
Leningrad	B-Device
.	O
</s>
<s>
An	O
estimated	O
number	O
of	O
19,000	O
cameras	O
were	O
made	O
before	O
Leningrad	B-Device
was	O
besieged	O
in	O
September	O
1941	O
and	O
suffered	O
heavy	O
damage	O
.	O
</s>
<s>
It	O
was	O
predeceeded	O
by	O
the	O
"	O
Filmanka	O
"	O
SLR	B-Algorithm
designed	O
in	O
Russia	O
by	O
A	O
.	O
</s>
<s>
The	O
shutter	O
operation	O
incorporates	O
a	O
quick-rising	O
non-returning	O
reflex	B-Algorithm
mirror	I-Algorithm
.	O
</s>
<s>
The	O
camera	O
bayonet	O
lens	B-Algorithm
mount	I-Algorithm
incorporates	O
the	O
focusing	O
helix	O
with	O
an	O
infinity	B-Application
catch	O
,	O
and	O
the	O
mount	O
itself	O
is	O
similar	O
to	O
that	O
for	O
the	O
Zeiss	O
Ikon	O
Contax	O
.	O
</s>
