Double bed metal portable antique box spring in North Saanich, British Columbia for sale

Great for cleanliness and lifespan, no chance it gets infested by bugs, and no material that will wear out. Hypoallergenic etc.
Also very quiet, no chance of squeaking.
Great for moving, takes up hardly any volume, and has a convenient bar on both sides to lift it.
I've had it and been satisfied for about 5 years, but girlfriend didn't like it as she thinks it's slightly bendy and contours the body as opposed to completely rigid, so it's gotta go.
Brand is Simmons Slumber King and I'm pretty sure it's an antique. I found something on internet about them being made from 1900-1950. Might be worth something for that, but in any case it's quality to use also, and it's in excellent condition.
I have no idea what this is worth so make me an offer.