Seth Thomas “Plymouth” Tambour Mantel Clock

March 22, 2010 | By | 4 Replies More

Here is another “Plymouth” tambour mantel clock by Seth Thomas (see this post for two others). This one does not have a date code, I estimate that it is from the early 1930s. It has a no. 89I movement that strikes the hours and half-hours on a coil gong. The movement has a code of R-6 on the back.

The case is 19 3/4 inches wide and 9 1/4 inches tall. The dial has a 4.5 inch time track, and is aluminum with embossed and painted numerals.

The movement has the original mainsprings that still open up very far and provide plenty of power. They are 3/4  inch wide loop end springs. The thicknesses are:

Time mainspring: 0.017 inch

Strike mainspring: 0.0167 inch

Job 5146. I had last repaired this clock over 10 years ago, and it just needed to be disassembled and cleaned to make it run well again.


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Category: American Clock Mainsprings, American Clock Repair, Seth Thomas Clock History

Last updated: March 22, 2010

Comments (4)

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  1. DENNIS says:

    Hi I have read all the above notes
    I have this same clock with the chime coil
    in the center the picture posted has the same scroll
    painted in front under dial on the brass clock works
    left side 78747 R-4 also 891 so it came with key and
    glass on front cover missing works only a few minutes and
    stops needs cleaning how do you find out value and year made?
    Thanks Dennis

  2. Richard Hammer says:

    Hello,
    I have this exact clock that my mother gave me. It belonged to her parents. They purchased it when they were married about 75yrs. ago. It is running slow and sometimes stops ticking altogether. I suspect it needs to be cleaned and maybe some parts replaced. Please email me with details on repairing this clock. Thank you, Richard Hammer

  3. Tom says:

    any significance to the R-6 on the plate. I have one like it readsR-11.

  4. Tom Nagel says:

    Bill, I have a Plymouth mantel clock I purchased at an antique mall for $90.00 about 10 years ago. It has the 891 stamp on the workings however my strikes on each quarter hour as well as the hour.It has an ” S 11″ stamp just below the 891. Looks identical to the one you have pictured except I have some inlay work along the bottom. What would this clock be worth? Just had it cleaned and some parts replaced. Works perfectly

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