[Arran]

Nice set, I take that you also reside in Canada since you had one of these before. Marconis from the 1930s had some very nice cabinets, even nicer then many Rogers sets in my opinion. I don't know who made these cabinets for Marconi but I suspect that it may have been Victoriaville Furniture or another Quebec based cabinet maker since Marconi was based in Montreal, but then again I have a Marconi type 12 from 1928 where McLagan Furniture built the cabinet and they were based in Oshawa.
As for touching up the top I'm not sure how successful that might be, as you can see the top and the control panel is one piece, so whatever you do to the top has to blend in with the rest. It looks like the feet at the base of the skirt/toe kick is almost bare, that portion would have to be refinished, perhaps selectively by masking it off from the rest. It wouldn't necessarily be a bad thing to strip the cabinet and start over, but without seeing the rest it's hard to say.
Regards
Arran