The old one was stolen which doesn't help...I can't remember the make.

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Probably stolen by somebody else who was quoted $500 for a $99
appliance.

Check out the smallest Sanyo's. I've seen some of them in compact
galleys.
New boat specs don't usually list the appliance by brand name, unless
it's something prestigious that adds some sales value. Builders like
the flexibility of switching suppliers on the small stuff, just in case
somebody offers them a screaming deal.

How old is your Maxum? Any chance you can just take a look at another
one on a showroom floor or broker's dock to see what make and model the
microwave is?