I came across an interesting Dr.Grabow. It has the spade on the top of the stem and the stem is screwed into device stamped distiller. The only stamping on the bowl is 8415. The shank is really short so I was thinking this could have been a mod but at the same time it looks like it could be factory. The pipe has no Linkmans or Dr. Grabow stamp so really I have no idea what I have. I've tried searching the web but haven't been able to turn anything up. Anyway here are some pictures.