: Hi Frank, welcome to OTD. You are correct that it is unusual to see
: a (modified) calibre 11 in a GMT but not unheard of. It is
: recognised that the early 1163 GMTs used the cal.11 but there do
: also seem a few 11630s that used it also-a couple of which can
: be seen here-

:
: http://www.chronocentric.com/forums/heuer/index.cgi?md=read;id=86957

: and here-

: https://www.bonhams.com/auctions/24883/lot/55/

: the latter being the most interesting as the serial is also 262xxx.

: So while not being the norm, it is not totally unique in that
: sense.

: Hope that helps,
: Steve

Steve, you’re right with the serial number. It’s really interesting you found that as its only around 120 digits from mine which I’d have to believe they were made in the same production run. Talk about a small world.