Unusual Peterson?

[Idlefellow]

An auction site is showing a deep bend Peterson system which is new to me: I've not seen one with the incised double line on the bowl. Also it appears to have a fishtail mouthpiece which is unusual for a system pipe, unless it is a replacement? Not interested myself but wondering if anyone has seen this before on a Pete system bent?

 

[ftrplt]

Are there any stampings/markings/numbers on the briar or collar?? Nice bent bulldog it appears!! FTRPLT

 

[Idlefellow]

Just checked my Irwin & Malmberg Peterson pipe book. I believe it is a system Baskerville, one of two system Sherlock Holmes shapes released in 1990 but with a replacement stem.