I don't think any of us would live long enough for one of the fake collectable guns to gain any significant value. I think if you put a plain new one of the same basic model "under the bed" with the fake, for the same amount of time, it would bring as much, or maybe more than the fake. BTY, I wouldn't want a Chinese 56 Chevy; a 57 now, that would be something to hope for.
Mike