Mike,
You seem to come across alot of very interesting bottles...we should talk more sometime!
I did a bit of research on your bottle, and found a few things for you:
1) The registration # is an English "Design Registration" (like a cross between a copyright & a patent) dating to mid-August 1909.
2) Your bottle was issued by "Macdonald, Greenlees, & Williams LTD": This name configuration began in 1919 & ended in 1926, when the company joined DCL (now Diageo) and became "Macdonald Greenlees LTD".
3) Your bottle also has a driven-cork closure, which is consistant with a pre-1930's Old Parr bottle, as this brand used a Spring-cap after 1931, and Screw-cap after 1959.
Hope that's helpfull for you...Drop me a line sometime, I'd love to talk to you about some of your bottles!
Cheers,
Walter C Hurst
wchurst@hotmail.com