HistoricTimekeepers Restoration Services and Supplies

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HTI Main Page
Warbird Clocks for Sale
Preproduction Display Cased 37500
When Only a Watchmaker Will Do




Popular Highlights


Notes for Young Watchmakers

HTI Approach to Service

Microscopes in Watchmaking

When only a watchmaker will do

The 37500 Contract Prototype

Restoration of Omega Jump Seconds Clock

Shop Tour

Photo Series Index Page

Warbird Clocks for Sale

Equipment for Sale










Restored Jaeger Lecoultre WWII Aircraft Clock                             WWII USN Jaeger LeCoultre Aircraft Clock

Aircraft Clocks


Restored WWII Waltham CDIA Aircraft Clock                    Waltham Civil Date Indicator Aeronautical (CDIA)


 Restored Hamilton Elgin 37500 Aircraft Clock
WWII Hamilton Mod 37500


Preproduction Sample Elgin Hamilton 37500 Aircraft Clock in Original Lucite Case with Skelentonized Dail

Preproduction 37500  used for final contract approval  


We service all mechanical aircraft clocks and try to maintain an inventory of fully refurbished/restored warbird clocks for sale.  If you are seeking information about clocks we for sale (Hamilton, Elgin, Waltham, Elgin, Junghans, Smiths, Kienzle, Jaeger) please see Warbird Clocks for Sale.   As  a rule, we have clocks available for WWII aircraft from the British, German and US air forces.  Very rarely we have pieces from Japanese, Italian and French forces.

A one of a kind piece that may be of interest is the display case Hamilton/Elgin 37500 explained here.  I did make the skeletonized dial and can offer skeletonized dials on demand.

NOTE:  We have the only stock of brand new stainless mainsprings for the three major WWII clocks: 37500, LeCoultre/Smiths Chronoflite and Waltham CDIA.

Our parts inventory includes dials, new unbreakable mainsprings, hands, balance staffs, knobs, etc.  We seek old caches of original parts before they wind up in the landfill.  Some parts are unavailable yet commonly need replacement (such as knobs, winding wheels and stems in some of the Swiss models).  These we make in small runs in our shop.  Please note that unless offered on our professional products page, we only provide parts in the course of a restoration.  As a rule, our parts inventory is maintained solely to support our repair activities.  Aircraft clocks are highly collectible and a great deal of fun.  They are precision instruments made to withstand rugged conditions encountered in combat aircraft.  They also can also have a number of complications (features) including: chronograph, elapsed time and calendar.

An example of our work is the restoration of  this rare 1937 RAF Time of Trip Clock of Swiss origin but no identifiable maker.

These clocks need to be serviced just like any precision watch.  In fact, more so.  A modern watch is well sealed against moisture and dirt.  These clocks are not as tightly sealed and frequently are installed in unpressurized aircraft that operate at over 10,000 feet.  The changes in temperature and humidity can degrade the lubricants and the atmospheric dust works its way into the case through the openings for the winding stem and function buttons.

These clocks are completely disassembled when overhauled. It is the only way to check all jewels, springs and pivots.  During service it is important to install new mainsprings, renew all pivots, adjust the escapement and various functions for wear, clean the case and dial, refinish hands if needed, etc..

For more information,  see How We Service and When Only a Watchmaker Will Do.

ATTENTION!  This year I received several requests to make corrections to several aircraft clocks under warranty.  I would have done, except the work was not mine.  Apparently there is someone very active on eBay using a similar sounding business name and a website that is similar in layout to mine.  While I am flattered, this causes problems for those who use and or collect aircraft clocks.  Every piece I service is recorded in my invoicing system and is tagged with my service label, as well as the mainspring barrel is marked in pen with the date and location of where the mainspring was last serviced.  Also, you the customer will have an invoice/receipt from Historic Timekeepers, Inc.

 I cannot be responsible for someone else's work.  I provide service to organizations that include the USAF, the USN and military contract service providers and aircraft restoration hangers.  I take my work and my reputation seriously.

The Basic Service Charges are as follows:

Time only (A-11 Type)                                              $295

Time and Calendar (CDIA)                                       $335 

Time and Chronograph (MIG)                                  $375

Time, Chrono, Elapsed Time (Chronoflite,Mig)       $425

Time, Chrono, ET and Calendar 

                          (Hamilton, LeCoultre)                       $475

These prices will cover the cost of all work needed to bring an unabused clock to good running order.  If parts are broken or missing, they will be charged the rates quoted on the Custom Parts Page.  



For shipping  or ordering information, contact:

Dewey Clark                   410.592.9998

Email Contact:         Historictimekeepers@gmail.com

Site Created and Expanded since 1999!!

(Watch my hair go grey)