American clocks with double dials, often referred to as “double dial” or “two-dial” clocks, were common in the 19th century.
There are two categories of double-dial clocks but first, let’s talk about the calendar clock. These clocks typically have one dial for the time and another for the calendar. The reason for this design was to provide both timekeeping and a calendar function in a single device.
Seth Thomas 8-day office calendar 1895
By integrating both time and calendar functions into a single clock, manufacturers provided a practical solution for the needs of households and businesses.
Welch 5-day calendar clock 1880
Moreover, before the widespread adoption of standardized timekeeping systems, local time could vary significantly from one place to another. Having a clock that displayed both local time and the date helped people coordinate activities and synchronize their schedules more effectively.
Fashion (Southern Calendar Clock Co.) and Ithaca were well-known makers of quality shelf and wall calendar clocks. Seth Thomas was a significant producer of office calendar clocks.
Ithaca 30-day calendar clock 1866
Less common are double-dial clocks that exhibit two separate times. A typical two-dial clock of this type would display railroad time and local time or railroad time and city time.
Seth Thomas double time #17 special order clock
When the two major US railway companies adopted Standard Time in 1883 the Seth Thomas Company began the manufacture of 8-day weight-driven clocks with two time dials. The clocks would come with an upper and lower plaque depicting local time and railroad time. Some clocks were production clocks while others like the #17 were special order clocks.
Seth Thomas double time clock#6, a production clock
Both dials are run by one movement with a connecting drive shaft between the upper and lower units. Once the upper movement is set up, the lower unit will display the relative difference. Moving the hands on the upper unit moves the hands on the lower unit accordingly.
Upper movement and the lower unit are connected by a drive shaft
Examples of the more prevalent #6 can be readily found, whereas the specialized #17 is exceptionally rare. Regardless, acquiring either double-time model would entail a significant investment of thousands of dollars.
Nothing is perfect. Antique and vintage clocks often suffer the ravages of time and neglect and a neglected old clock is far more difficult to bring it back to life if it is missing crucial parts or repairs have been crude and haphazard. Improper restoration can significantly decrease or destroy the value of some pieces. However, the repair of a botched restoration might be the right choice in certain circumstances.
A complete clock is always the first thing I am looking for when adding new clocks to my modest collection. Dealbreakers are usually broken and irreplaceable tablets, replacement movements, missing crowns or toppers, and unreadable (ruined) dials. A clock that is complete and not altered is always preferable to a clock that someone has “worked on”.
Junghans Crispi wall clock: A ground-up restoration with many new parts, however, it is a functioning clock that shows well
I may consider clocks that have a refinished case if the standard of refinishing is high. I am almost never opposed to cleaning a clock of grime and dirt and applying a coat of traditional shellac (if needed) if that was the original finish or remediating minor veneer issues. A missing finial can always be replaced with a suitable alternative, clock hands can be replaced and some clock movement parts that have worn out can be purchased from a variety of sources.
Does the total restoration of a Junghans Crispi wall clock (above) with many new parts some of which are not faithfully reproduced have value? Perhaps not, but the buyer might be pleased with the end result.
One might argue that any change can devalue a clock but most collectors I know are content with making subtle alterations to the clocks they work on if it means improving the look of the clock, putting it in running order, and presenting it as more desirable for resale.
I recently read a very interesting article (no link due to a paywall) that posited that in select cases reproduction parts may not devalue an antique clock and in fact, might enhance its value if the parts were made exactly the same with the original machinery.
Not the $20k clock but a clock made by Ithaca Clock Co. C.1865 (NAWCC clock museum Columbia Penn.)
The clock mentioned in the article is an Ithaca double-dial calendar clock that sold at auction for close to $20,000 despite eleven “new” reproduction parts. The photo above shows an example of another clock made by the Itaca Co. in the 1860s.
I was intrigued by the repair and the article went on to mention the work of Joel Warren. Mr. Warren operates a business called Ithaca Calendar Clocks Co. The company specializes in making reproduction pieces for Ithaca clocks. Mr. Warren has a past association with the Ithaca company and possesses the original circa 1895 shaping machine, knives, and tooling from the company. He can reproduce arches, circles, and ovals of varying lengths and widths.
Back to the question: do reproduction parts devalue a clock? The answer as you would expect is yes, no or it depends. Two experts looking at the same clock might agree that the quality of the restoration might enhance a clock’s value but disagree as to the extent of restoration particularly if the restoration goes too far when most or all of its original components are replaced. Is it then the same object?
Case in Point
In what circumstances is the repair of a botched restoration the right choice? A bad repair or restoration of the case might be irreversible but structural repairs should be addressed.
I won a Scottish tall-case clock at auction 3 years ago. It was a relatively inexpensive acquisition but the clock came with a number of issues. I won’t go into the repair of the movement but a lot of work went into rectifying the strike side.
There were issues with the case but the main problem was a detached backboard. The broken backboard (held on by crudely applied modern finishing nails) certainly made it easier to transport the clock in my station wagon because it fell off when I attempted to move the clock. I knew that it had to be repaired otherwise the bonnet would not be stable.
Scottish tall-case clock with broken backboard
I first had to strengthen the side mounts with high-strength hide glue and slotted screws salvaged for an old clock case. It was not enough to screw the backboard which was in two sections into the side rails so, I fashioned a cross brace of salvaged pieces from an old 140-year-old ogee clock.
Re-attached backboard with cross bracing
The structural repair was necessary because a previously unstable backboard is now much stronger and able to support the bonnet.
Other than cleaning the case and dial and applying two coats of traditional shellac to the wood surfaces the front of the case is as found.
On display
Nothing is perfect but some flaws can be addressed with minimal intervention without taking too much away from an antique clock and might even enhance its value.
Antique and Vintage Mechanical Clocks 
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