It's pretty easy to google "Heuer Autavia" and see what comes up. Within 10 minutes of reading / surfing around, he would know exactly what it's worth. If someone doesn't go through the extremely minimal effort of looking something like that up, why should they be rewarded? I understand what you're saying - that it's a good samaritan-like deed to let them know how valuable it is - but I just don't see it that way.