Chaim's right.
Replica on the left, real on the right.
The replica is a Parks I've cut down the middle for another cutaway project.
Note the position of the G in relation to the tab hole.
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Here you can see the letter spacing is different.
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Here you'll notice the finish, or the 'warmth' of a real Graflex, at the top.
The replica is a little too silver, for want of a better word. Also, the brushing is not so defined, or in other words too fine compared to a real Graflex.
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Other things to look out for is the clamp lever, which on a replica is too silver (chromed) and appears to be plastic.
The red button's chroming will be too bright.
The raised hole that holds the glass bulb can sometimes not look right - the transitional 'line' between the body of the Graflex and the hole will not be as defined.
Lastly, the brass recharge pins will have a patina too them on a real Graflex, whereas replica pins will be too new, or have an uneven weathered look. Remove the red button and take a look at them.