Hi everyone!

I have my eye on a Masterpiece 644G right now. As the seller states it writes nicely (EF?), but the piston leaks a little at the top.
How risky is it with that piston?
I have no idea for how much do they go these days....

5dd6_1_big.jpg
5dd6_2_big.jpg
5dd6_3_big.jpg
5dd6_4_big.jpg
5dd6_5_big.jpg
5dd6_6_big.jpg
5dd6_7_big.jpg