Smiths / Jeager la Coultre - 早期二战座舱钟，年份：1939。 - Smiths 的 8 天航行计时航空钟

出售的是一枚由Smiths在1939年9月出产的、军方颁发的8天旅行时间计时航钟的优秀实物示例，机芯来自Jaeger LeCoultre。
钟表处于极其良好且原装的状态。完全运作，且时间记录极为精准。
背板完好且完整标记。
装在一个定制的金属支架中，便于用作桌钟等用途。
钟盘直径7.5厘米，支架尺寸为15厘米×14.5厘米×8厘米。

如何为这枚机芯定年？

通过表盘正面的序列号，我们可以将这枚驾驶舱时钟精确定位到1939年9月。

这种驾驶舱计时器具有长久的使用寿命。二战初期，它们被用于汉普登轰炸机，英伦战争期间则在斯皮特火（Spitfire）战斗机上使用。鉴于生产年份为1939年，它也经历了英国伦敦空战。背部的皇冠带有字母A.M，这表示空军部（Air Ministry），此标记在二战中使用。
表盘为24小时制，战争后期改为12小时制。
这类24小时制的驾驶舱时钟因处于二战初期而显得珍稀，大多在战争中损毁或失踪。

机芯为高品质的瑞士Le-Coultre 330，具备用于“经过时间”的计时表盘位于12点的位置。
由于为8天机芯，作为桌钟使用再合适不过，并可在每个工作周初进行上链。
它可以照原样使用，配有支架。
也可以装在底板上，以模仿外壳外周有2.5英寸的孔洞及间距，这正是其在驾驶舱中的安装方式。
左侧按钮可拉出并用于设定时间，按下此按钮可让机芯上弦（逆时针方向，这点较为少见）。
曾有飞行员试图顺时针方向上弦，因而损坏；因此最好不要将钟完全拧紧上满。
右侧按钮用于启动旅行时间并复位计时器。
运作良好，机芯速度可通过外壳背面的滑块调控。
漆面原样完整，表盘与两表盘的指针亦然。
夜光指针仍能发光，但很短暂；将其置于光线之外的黑暗环境中，指针发光仅持续几分钟并呈现绿色。

机芯尺寸（不含支架）
宽度：82.6毫米（3.25英寸）
壳体厚度：41.0毫米
所有尺寸均为近似。

再次说明：这枚时钟的工作原理如下：

金属外壳时钟搭载在瑞士制造的Jaeger-Le-Coultre 8天机芯，具13颗宝石。
为无钥匙上链的机芯，配有7.5厘米、12小时制的黑色表盘、夜光阿拉伯数字（仍然短暂发光）以及额外的12小时表盘用于记录“旅程时间”。
高品质机芯提供用于旅时的计时功能。
时钟上方、4点与8点位置各有一个按钮，控制钟表的运作，背部在外壳后方有一个滑块上的杠杆用于调速。
左侧旋钮作为上弦钮（逆时针旋转），拉出时可用于设定时间。
注：往往有飞行员试图顺时针方向上弦，结果导致其损坏；因此，不要将钟上弦拉紧到极限。
8点位置的按钮在按下时会停止秒针，继续按下一次又会重新启动秒针。
最后一张照片为对字样更清晰的改进版本，以便阅读。

英文描述：

For sale, this excellent example of an army-issued 8-day travel time chronograph aircraft clock from Smiths from 1939, the movement is from Jeager la Coultre.

The clock is in exceptionally good and original condition. Fully working and keep track of time very accurately.

Fully marked back plate.

Mounted in a good custom-made metal holder for use as e.g. desk clock.

Clock pointer diameter 7.5 cm, holder size 15 cm by 14.5 cm by 8 cm

HOW DO WE DATE THIS MOVEMENT?

From the serial number on the front of the dial, we can accurately date this cockpit clock from September 1939.

This type of cockpit chronograph has a long service life. At the beginning of the Second World War they were found in Hampden bombers, during the Battle of Britain they were used in the Spitfire, given the production year (1939) it experienced the Battle of Britain.

It has the crown on the back with the letters A.M which means Air Ministry, this marking was used in WW2.

The dial has a 24-hour layout, which was later changed to a 12-hour layout in the war.

These 24-hour cockpit clocks are rare because they date from the beginning of WW2, most have been lost in battle.

The movement is a high-quality Swiss Le-Coultre 330, which has a chronograph for the expired time dial (time of trip) at 12.

Because it is an eight-day movement, it is ideal for use as a desk clock that is now wound at the beginning of each work week.

It can be used as is, with the holder.

Or maybe on a plate to mimic the 2.5′′ holes with space on the outside of the housing, and that's how it would be mounted in a cockpit.

The left button is stretchable and then sets the time, pressed with this button the movement is excited (counterclockwise which is unusual)
It often happened that pilots tried to wind up clockwise, causing them to break down, by the way, it is better not to wind up the clock completely tight),
The right button is to start the travel time and reset the chronograph mechanism.
It works well and the speed of the movement can be controlled via a slider at the back of the housing.
The paint is all original, as are the dial and the hands of the two dials.
The luminous hands still work, but very briefly, after being placed out of the light in a dark room, the hands only light up green for a few minutes.

Size
Width 82.6 mm (3.25 inches)
Case thickness 41.0 mm
All sizes are approximate.

So again:

How does this clock work:

The metal cabinet clock has a Jaeger-Le-Coultre 8-day Jaeger-Le-Coultre made in Switzerland with 13 jewels.
It is a keyless movement with 7.5 cm 12-hour black dial, luminous Arabic numerals and an additional 12-hour dial that records the 'time of the trip'.
The high-quality movement provides a chronograph action for the time of the trip.
Two buttons at 16 (4) and 8 o'clock, control the operation of the clock and there is a lever behind a slider at the back of the housing are for controlling the speed.
The left knob acts as the winder (rotate counterclockwise) and, when pulled out, can be used to set the time.
N.B. (it often happened that pilots tried to wind up the clockwise, causing them to break down, by the way it is better not to wind the clock completely tight),
The button at 8 o'clock stops the second hand when it is pressed and a further press restarts the second hand.
THE LAST PHOTO IS AN IMPROVED VERSION TO MAKE THE LETTERING EASY TO READ!