If you have a 37500 clock you need
serviced, you will find services and charges listed on the Aircraft Clock
Restorations and Repair Services page.
The 37500 is one of the most complicated clocks
produced for use in aircraft. It has functions for displaying 24
hour time, running seconds, length of trip (12 hour), 60 minute center seconds
chronograph and Civil Date. It has a large 2 3/4 inch dial
opening. Its production was also complicated with
the contract split between Hamilton and Elgin watch companies.
Elgin made the plates, screws and escapement, Hamilton made the other
parts. The parts were then transhipped and each company assembled
finished clocks. They were paid for both parts produced and clocks
assembled; poor contract officer!
The 37500 was
a replacement for the Jaeger A-10 ordered before the US entered
WWII. The Jaeger product also provides Civil Date and a Time of
Trip function and was used in pre-war USAAC and USN aircraft. But
with the entry of the US into the war, military timepieces from
Switzerland were no longer available. All US watch companies were
required to turn their production to the needs of the US military and
this clock was a high priority. As far as I know, the production
of nearly 28,000 clocks went to the USN Beu. of Aeronautics and was used
in TBF, TBY, PBY and a number of carrier based aircraft. It was kept in service
well into 1990s as evidenced by various depot tags that may be affixed
to a clock case. These were even issued to Orion P-3s!
37500 clocks sold or serviced by Historic Timekeepers have new
unbreakable mainsprings installed rather than 60 year old carbon
mainsprings that are fatigued or rusted and ready to break. It is
the only way we can get good performance. We are the ONLY facility
that has access to these springs!
37500 sold by HTI also has an original new/old stock dial and the
hands are finished in the original color scheme. Most of the
clock dials were refinished with white markings by the USN in the 1960s
and the hands were also painted white. This change directive was
an attempt to comply with no radium policy; however, the dials and hands
were not, and are not radioactive. While some foreign clocks DID
use radium, the 37500 did not.
We can provide
dials and hand refinishing service to customers during the course of
overhauling their 37500 as well. However, we do not sell parts.
a 37500 is serviced, it is completely disassembled, individual parts
cleaned and inspected, replaced or refinished as needed. If a
37500 sent in for service needs a new part (balance staff, jewel,
mainspring, hand, knob, dial) this will be noted in the quote for
Cost of Fully Refurbished
37500 with NOS dial, unbreakable mainsprings, Certificate of
Performance and 1 year warranty: $1100 plus shipping.