Daniel -- it's possible that the piece you refer to was made in Canada.
This era turns out to be among the most interesting in Harbour Lights history IMO. And for those who like to collect variations, it's a 'gold mine'.
According to Kim in a discussion at the 1997 Collectors Reunion, when Harbour Lights shifted production to Castle Studios in Ontario, Canada the original molds were shipped to the Studios along with a supply of the grey felt used on the bottoms.
Sometime during production in Canada, Castle Studios offered to 'clean up' the molds, improving the doors and windows and adding a 'collar' below the ventilator ball on the tops of towers. This strengthened the ventilator, making it less likely to break off. They also replaced the hand-shaped ventilator ball with a ball bearing, making the ventilator a perfectly round shape.
Thus the 'Canadian changes' didn't necessarily happen immediately after production began in Canada.
According to Kim, the original Southern California production was supposed to have been 250 of each of the 'Original 17'. However all 266 of the Original Cape Hatteras were made in Southern California.
You can read more about these changes in an archived area of the Harbour Lights web site at:
www.harbourlights.com/archive/modifications/ (Sorry, some of the images are missing from this page.)
Also check out this page on the shift of production to Canada:
www.harbourlights.com/archive/modifications/pages/canada.htm Keep in mind that pieces were/are not necessarily numbered in the order in which they were/are cast. They are cast, placed on racks, pulled off racks, cleaned up (mold marks), perhaps replaced on racks, painted (not by one person all at one time), bottom material added (probably after painting), inspected, and hand numbered.
It depends on how many were ordered produced at one time. In the early days, orders may have been placed in quantities of 250. Today, some pieces with small production runs are ALL produced at one time.
I doubt that the typical FIFO (First In, First Out) method was used at each step. So it's probable that the order of production is very different from the order of casting within a production run.
This means that your #423 does NOT mean that all the pieces from #251 (assumed to be the first number assigned to a Canadian produced Quoddy) to #500 (if 250 were ordered) would all have the same modifications and same bottom material.
Remember that a typical Canadian piece have a 'flocked' bottom in which glue was spread on the bottom (back from the edge a bit) and the flocking was applied (dipped?) to the bottom.
CF members and guests can also read more about these terms and see examples of pictures of some of the modifications at:
www.harbourlights.com/glossary.htm Paul Brady has a West Quoddy that has a very different paint job -- the window sills and other areas have a pink paint job. I believe there has been one other such paint job reported on these Forums.