It's possibly just a typo, but if you're referring to a "space-saver", by definition that means a wheel/tyre that is smaller than standard, so that it doesn't take up as much space in the boot or wherever.

Maybe what you have is a full-size spare wheel/tyre.

The tyre size and type is identical to those on the alloys. The spare steel wheel has got the space saver type 50 mph warning on it.

I've never understood the 50 limit applying to a full (or equivalent) sized spare even if its rated T or H instead of V or Z.

Wheelbarrow tyre fair enough, though i see enough of them fitted and the car bowling along with everyone else at 70+.

Check the offset on the spare matches those on the alloys - look for the ETxx stamp on the wheels (not tyres) e.g. ET43 etc. If it doesnt then its a mismatch and has to be speed restricted by law., otherwise peel off the sticker if you wish....

Bought a new Mondeo in 2002 which came with a full sized steel spare complete with a Pirelli identical to the other 4 and a 50mph sticker. Asked dealer why and surprise surprise, he had no idea. He did refer it to Ford who came back and said that although the steel spare was dimentionally identical it was a lighter construction than a normal steel wheel and was not rated for speeds over 50mph.

So I visited a local dismantling yard and bought an alloy off a recent right off (back wheel off a car fire damaged by faulty phone wiring) fitted the tyre off the steel spare and guess what, never used it.