crown wanted for 1937 trench watch

col@computel.co. · Dec 19, 2025

hi, I've lost the crown from my 9ct gold 1937 Longines trench watch serial number 5518872 - any ideas where I might get one please, or even how I find the size, pattern and thread?

Dan S · Dec 19, 2025

I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M

J_pilot · Dec 19, 2025

Dan S
I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M

I actually just bought a near identical example, in what seems to be very original condition, right down to original strap and buckle. If the crown on mine is original, then it appears identical to the one used on 13ZN examples in the same period, as well as early 30CH watches. If so, they’re quite expensive but occasionally turn up: https://ebay.us/m/YavCOS

No guarantees it will fit, but perhaps an idea worth digging into further.

-Juergen

J_pilot · Dec 19, 2025

Some additional photos for posterity

col@computel.co. · Tues. 9:38am

Dan S
I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M

hi, thanks for your response. I've attached another photo but having difficulty with reflective light and close-up focus. The stem appears to be still there - it's just the crown which has become loose and unthreaded itself from the end of the stem.

col@computel.co. · Tues. 9:40am

Dan S
I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M

The diameter of the movement measured inside the case is 27mm

Dan S · Tues. 9:53am

[email protected].
hi, thanks for your response. I've attached another photo but having difficulty with reflective light and close-up focus. The stem appears to be still there - it's just the crown which has become loose and unthreaded itself from the end of the stem.

So either you need a new crown, a new stem, or both.

col@computel.co. · Tues. 9:57am

[email protected].
The diameter of the movement measured inside the case is 27mm

the link you sent is for a series launched in 1942 although the serial number of mine and the hall mark indicate the watch was made in 1937.

col@computel.co. · Tues. 10:06am

Dan S
I assume you are looking for the stem as well. If so, start by identifying the movement caliber. It might actually be stamped on the movement if you look closely, or even post some well-lit in-focus photos from various angles. Knowing the diameter of the movement can also be helpful.

Edit: I am guessing cal 27M.
https://ranfft.org/caliber/7562-Longines-27M

down by the flywheel it is engraved with '27' followed by a smaller '0' or perhaps'9'

col@computel.co. · Tues. 10:09am

Dan S
So either you need a new crown, a new stem, or both.

it's the crown I've lost but I need a spec for the diameter and thread on the existing stem as well as any 'shoulder/stub' or whatever the correct term is, on the replacement crown.

crown wanted for 1937 trench watch

[email protected].

Dan S

J_pilot

J_pilot

[email protected].

[email protected].

Dan S

[email protected].

[email protected].

[email protected].

Similar threads

Trench watch, availability of parts?

Help with determining year of WWI trench watch

Rolex Trench Watch

Omega Trench watch advice

1915 Trench watch timekeeping problems

Longines Russell’s Ltd Trench Watch on its Way