That HLT Royalton stamp was used on the original Royaltons made back in the 40's-early 50's before Sparta decided to make a Dr. G. Royalton,which didn't come out until sometime in the 80's IIRC. Tom D. tells the story about the stamps used over at the DGCF.I ordered a rustic Royalton when there was a thread saying they were going to stop making them in 2012.
The very first thing I noticed was no Dr G spade on it. how sad. But it smoked really nice right from the first bowl. Feels great in the hand, perhaps I'll hunt up a smooth one to go with it.
That's because it bears the HLT shield stamp which is a DG stamp for that line of pipes.