we had one with that very same crown-in-the-forkcrown panto come up about 2 or 3 months ago. I can't recall what the make finally was but if you search the archives you may find the thread...pretty sure not a Monark cause the style of crown was wrong.
EDIT: found the thread by searching http://www.bikeforums.net/showthread...+fork+crown%3F
if you make it all the way to post#50, you'll find a pic of that crown that looks just like yours and the ID: Giovanni Losa
Amazing how much kicking that frame around we did (and especially me) before somebody brought the goods! But it was a weirder, earlier Losa frame with a slightly different crown and strange dropouts...(that's my excuse and I stick to it.)