This doesn't exactly qualify as Classic/Vintage, but does anyone have a source for the frame geometry specs on a 1998 56cm Merlin Titanium Road frame? Considering a long-distance purchase with a seller unable/unwilling to measure the thing for me.

I would stay away from the purchase. I don't know what the selling price is but more than likely it ain't cheap. I would want to know as much as I could before purchasing. If the seller won't/can't measure they are not a serious seller IMHO. Both would be a deal breaker for me.