The bad news is that it's fake. The good news is that it's a pretty good fake; and if you don't want a digital control but still want something Hakko-looking, then a clone is probably the best you can get --- they discontinued the original FX-888, just like the 936.
The fake FX-888 in question logs in at 1442 g. on my postage scale after calibration compared to the 1350 g shown. Same test with the line cord wrapped on top.
Most of the weight (and cost) is the transformer, so unless the fake added extra weights it seems like you didn't get an undersized transformer.
By the way, don't be surprised the knock off last a long time. I had a quakko 936 that I got for $60 8 years ago that worked the whole time. I just sold it recently for $40 on Craigslist after I upgraded to an FX888D.
Same for all the other 936 (and now 888) clones in general. Most of them (like this one) are based on the same pure analogue controller, all jellybean parts, not much to go wrong, easily fixed if it does break. The real one has an MCU of some sort.
Also unimpressive is the use of a DIN pencil connector over Weller's use of a reasonably high-quality screw-on disconnect and a cord of significantly higher flex and immunity to burns.
That's the same as a real one. Many of the 936 clones do use a metal screw connector, however.