Hello,
Marples also made a smoother with adjustable mouth. The X04. It had some things in common with Veritas smoothers and I'll bet Veritas designers had a look at this model when they developed the design. It had a fixed frog and a plate in front of the mouth that could be move fore and aft and then locked with a couple of screws. The tote was a loop handle that joined the frog at the top, like the aforementioned Veritas. They dated from the '50s and were innovative and different then the usual Bailey style planes. Probably should have caught on, but didn't. Cannot confirm the quality of these as never owned one, but I do know that Robert Ingham uses one.
The Marples after Record took over are much better than Stanleys of the same vintage and the irons are pretty good and a little thicker than the Stanley's. This quality soon dropped off, though. If you can get one of the early Marples/Record, you will find them good enough to fettle and use and will probably be cheap, too. (late '80s early '90s) I have an 04 which I love, with home made replacement handles. They can be identified by having Marples cast in the body around the knob, with Record cast on the lever cap, but not painted red (logo, that is, just left chrome). It will have a cam locking cap, not the later brass screw, when quality was poor and should be avoided. The only thing I do not like about the planes of this vintage, is the lateral adjuster is a stamped out bit of steel, rather than the ones with the roller riveted on, like earlier models. Aside this, the castings are good and heavy and they did come with wooden handles, allbeit the rear one in need of a bit of re-shaping. They were better then the red Marples before amalgamation. Old Records are still the best and I have a slight preference for the early Records over the early USA Stanleys, if I'm honest, though I suspect this is so marginal that my preference for British made, edged the Record.
Mike.