Hi, I already have some PMs out on this, but I thought I would use a shotgun as well as a rifle. Does anyone out there have a High Speed Picnic stove with the later 'patented' burner bell (with slits in the collar and a captive flame plate) AND the patent number stamped on the rim? These stamped burner bells are common on the 17Bs, but I don't have any data about them on the HSP. i would be very pleased to hear from anyone who has. Thanks.