Day, Date, GMT and a chronometer

[Lorne]

I know Ball do one by adding some in-house gearing to a 7750 movement, but does anyone else also make one? Generally companies appear to drop the day display and use that gear to drive a 24 hr GMT hand or disc.

[Justayellowbadge]

Plenty of COSC 7751's around.

[Lorne]

Justayellowbadge said:

Plenty of COSC 7751's around.

Indeed, but the 7751 is the moonphase variant favoured by werewolves, and to a lesser extent by sailors and divers. The 7750 GMT replaces day with a GMT hand. I'm interested in knowing who keeps the day function whilst also adding a GMT.

I bought an old Ball with all functions, just to see how they modify the gearing, and would like to do the same with any other manufacturers that keep the 'full house' of functions on a GMT variant.

Edit: I take it back, 7751 does have moonphase, but also day, date, chrono and a second time zone.

Edited by Lorne on Monday 14th May 11:40

[Justayellowbadge]

Lorne said:

Justayellowbadge said:

Plenty of COSC 7751's around.

Indeed, but the 7751 is the moonphase variant favoured by werewolves, and to a lesser extent by sailors and divers. The 7750 GMT replaces day with a GMT hand. I'm interested in knowing who keeps the day function whilst also adding a GMT.

I bought an old Ball with all functions, just to see how they modify the gearing, and would like to do the same with any other manufacturers that keep the 'full house' of functions on a GMT variant.

It also has day/date/month and GMT, so would fit your bill. Moonphase deleted in some applications.

[Lorne]

Justayellowbadge said:

Lorne said:

Justayellowbadge said:

Plenty of COSC 7751's around.

Indeed, but the 7751 is the moonphase variant favoured by werewolves, and to a lesser extent by sailors and divers. The 7750 GMT replaces day with a GMT hand. I'm interested in knowing who keeps the day function whilst also adding a GMT.

I bought an old Ball with all functions, just to see how they modify the gearing, and would like to do the same with any other manufacturers that keep the 'full house' of functions on a GMT variant.

It also has day/date/month and GMT, so would fit your bill. Moonphase deleted in some applications.

I think I'd be inclined to keep moonphase (for aforesaid werewolf market), but delete the month. I sometimes have trouble with which day of the week it is, but so far have been pretty accurate on remembering the month.

Layout of the functions on the dial is a little 'bitty' though, but can be jiggled around with some custom components. I expect this is why Ball used a standard 7750 layout and added GMT.

[Justayellowbadge]

Another option is to use the DD 7750 and fit a rotating 12h bezel, as Sinn have in the past.

Not a purist 24h GMT, but still a second time zone.

[Lorne]

Justayellowbadge said:

Another option is to use the DD 7750 and fit a rotating 12h bezel, as Sinn have in the past.

Not a purist 24h GMT, but still a second time zone.

That's actually the best engineering solution as it maintains simplicity, which is the key to things not breaking. Third option of course is to start the chrono at noon/midnight home time and use the hour counter at 6 as the second time zone.