I'm a huge Howard fan and I've gotten several things signed by him including the Rolling Stones magazine and the calendar he shot for the North Shore Animal League. I have 5 items total signed by Howard over the years. I can tell you without a doubt....your signature is the real deal!
I actually sent to Howard his newest Rolling Stone mag the day it came out......wrote a nice fan letter and got it back within a week and a half signed. I even asked him to personalize it which he didn't......He doesn't mind signing for fans. He hates ebayers... he actually said the other day on the show that he likes signing for his true fans but wouldn't sign if he was with his daughters......he doesnt want to be the dad that his fans are more important to his kids...and I think that's pretty fair...
Please let me know if you get Riley Martin....wouldn't mind having his too!
I have also gotten Sal & Richard (together), Gary, Robin and Fred using the Sirius address.