If you really want to spend all that money, my first suggestion is to google/bing on the knife and it's model number. You might locate a replacement(same knife) or at least a knife with a blade you could cannibalize and transfer to your present one; assuming it's absolutely necessary it have the same handle. The only (somewhat..to very) expensive alternative I can think of is to go to the various knife forums that have a custom knifemakers thread, or just google on custom knife makers, and explain the situation. Perhaps one of the makers there will consider that commission. It must have an awful lot of sentimental value.