看见几位前辈说起上海仿7750和ETA7750之差异，起了一探究竟之心，翻墙搜索一番，果然有相关帖子：
原帖地址在此：http://forums.watchuseek.com/f72/chinese-7750-a-220837.html 无需翻墙。
整体背面
上海7750：

ETA7750：

整体正面
上海


ETA


背面
上海

ETA

上海

ETA

上海

ETA

链盒与传动
上海
、
ETA

最后附上原帖主评论：
Again this is an old one, operating at 3 Hz, the newer one work at the same speed as the ETA/Valjoux 7750. These movements are not quite as well made as the Seagulls, Hanzhous or DGs. The skimping shows, the material for the reset hammers is thinner than the originals and this one had been bent in two places to get it to contact the reset hearts correctly. The mirco adjuster on the balance cock has so much play in it it is unusable, and I wind up just moving the regulator directly.
Major differences (aside from the speed):
The pallet fork has banking pins instead of buttresses on the pallet cock.
The day detent is on a eccentric instead of a fixed pin (compare the 4th picture in both threads) this is to allow for centering the day in the dial window. The day dial is also retained by a little clip, whereas the ETA/Valjoux it just has a washer on top of it and the dial keeps it in place. The day dial is not interchangeable with the ETA/Valjoux.
The reverser wheel in the autowinder has the Shanghai five jewel clutch, not the two pawls as ETA prefers (making this a 30 jewel movement.) This particular example refuses all attempts to free the clutch up and the rotor spins when it is wound by hand (I cleaned it, oiled it, dry cleaned it to get all the oil out of it, cleaned it again...)
The chronograph second hand brake spring had a bad temper and took a set and had to bent back into shape.
Despite all its problems and poor workmanship, the movement works well keeps good time.
大概就是说整体质量比海鸥杭州稍逊，跟原版有几个不同，做工有点差，但是走时准确。