Since four weeks equal one month, then maybe this one should be ‘Watch of the Month’ – and what could be better in that case than to feature the ‘Monthly’! Well I suppose it should be the ‘Monthlies’ since two such models feature in the Citizen vintage line-up, although they are quite distinct from each other in terms of their movements despite both being first produced in the mid-1960’s. Unusually these watches have a third window, displaying the month along with the conventional day and date windows. The month is manually selected via a second crown.
I’ll start with the slightly later model, which used the 5270 movement first produced in 1965, and is the version that is seen more often in the on-line auctions. Part of the Seven Star Deluxe range, this automatic movement was one of several lines using an oscillating weight system to drive them, as Citizen moved away from their circular geared ‘Jet’ rotor. The Monthly logo is found on models produced for the Japanese domestic market, whilst the export model became the ‘Moon-Dater’. Mine is from February 1969, and is a Monthly model:
The dial text says it all, with the Seven Star applied logo prominent above 6 o’clock. The case back also carries the Seven Star logo and the older style model designation of 4-52704Y, and the second crown to adjust the month, with its window in the chapter ring, is at 2 o’clock. The case measures 39mm across and is the same lug to lug so it’s a decent size watch:
The 5270 movement, with 23 jewels in this model, beats at 18,000 per hour and can be manually wound but not hacked. Interestingly, the ‘Moon-Daters’ for the European market used the 21 jewel version. The date quick sets with the crown pulled out one click, the day is set by winding back and forth between 9 and 12:
Whilst the 5270 Monthly was an early example of Citizen’s use of the swinging weight rotor, their earlier model produced in 1964 was one of the last watches to use their ‘Jet’ rotor. I guess as a result it had only a short production run, and examples are rarely seen. As far as I can determine it was only made in gold plated versions, and mine is of the white gold variety:
As can be seen this Monthly is part of the ‘Seven’ autodater line, using the 19 jewel version of the 4101 movement. This time the month window is on the dial at the 9 o’clock position and is manually turned by the crown at 8 o’clock. The month wheel runs over the date wheel and is perforated so that the date can be seen through it.
The serial number shows production in August 1965, and ‘WGP’ refers to the case plating:
This is a large watch for its time, measuring 40mm across the case and the same lug to lug. It is also over 12mm thick, perhaps reflecting one of the reasons Citizen moved to the more compact oscillating weight movement for its automatics.
Here it’s compared to a more conventional Jet model:
The 4101 movement beats at 18,000 per hour and can be manually wound, without hacking. The time is set by pulling the crown out one click, whilst the date is set by pulling in and out at the second click. The day is set by winding back and forth between 9 and 12:
It would have come in a box like this originally:
And finally a closer look at the dial and hands:
So two Monthlies, but very different, and good examples of the incoming and outgoing movement technology of the day.