The H500 offered continuous coverage of the shortwave bands from 2mHz to 8mHz. This was found at a recent local estate sale and is still in working condition and has some of the original paperwork in the back part of the radio including the manual. The antenna does seem to want to pop up a few inches and won't seem to stay all the way down. It is quite dusty but expected for the age of this radio.
Sorry I do not have any history on it but know that it was being used once in a while by previous owner and it is quite heavy.