12-24-2017 10:42 AM
12-24-2017 10:54 AM - edited 12-24-2017 10:55 AM
Just a WAG, 1920 or so?
I Googled and found this site for dating Seth Thomas clocks, maybe it will help?
http://www.antiqueclockspriceguide.com/labelstrademarks.php?lm=Seth%20Thomas
12-24-2017 08:45 PM
12-28-2017 05:47 AM
Tran uy Ly's Seth Thomas book (Arlington Book Co.) list "Tambors" from page 688 through 709 with 4 to 6 clocks on each page. Dated from early 1920's into the 30' yours appears to match one of the "Sentinel" models circa 1928. Clock could have been made a few years either side of that date.
12-28-2017 12:47 PM
The lettering on the bottom would have some relationship to year and month of manufacture. Their should be 3 more numbers , the were printed in reverse 1887 would show as 7881, 1892 as 2981 . The letters represented the month 1 = jan, 2 = feb and so on. They skipped the letter i as it could be interpeted as a 1 . So your J is the tenth letter = October but they skipped the letter i so J is September. They used this dating method starting in the 1880's but am not sure how long they continued to use it.