UPDATE: It's an R. Murphy Boston afterall

I posted recently about a new find which I had trouble confirming as being produced by R. Murphy Boston due to the lack of a marking. I asked the readers to chime in if they had any information and sure enough, this mystery is partially solved. Thank you Tommy Campnell for sending me the picture below of three R. Murphy Boston corkscrews from your collection. All three are signed R. Murphy Boston on the shanks. I think that it's now safe to say that my example in picture #2 was produced by R. Murphy Boston. The middle example of Tommy's is almost identical and even features the same Sterling silver swirl on the larger end cap.

The corkscrew that Robert Leopardi sold recently on ICCA still remains somewhat of a mystery. (picture #3) It's possible that the silverwork was done by Simon Bros while the corkscrew itself was produced by R. Murphy Boston, but the lack of markings makes it difficult to definitively confirm. As always, if anyone has any further information on this mystery, feel free to chime in.