Marco
Information from Wholesale, Retail, and Manufacturer’s Catalogs
Marco - 1921 - Catalogue No. 12
Marco Mainsprings
for
Seth Thomas pocket watches
Marco
Made by the C. & E. Marshall Company
Marco Mainspring Package No. 1001 – for Seth Thomas 18-size New Style Factory No. 536
Seth Thomas Model 6 & 7
Model 5 ser#’s 300,000 to 350,000
Marco Mainspring Alternative Package No. 1001 - Width 24, Strength 3¾, Length 20¼ – for Seth Thomas 18-size New Style Factory No. 536
Marco Mainspring No. 1001 – for Seth Thomas 18-size New Style Factory No. 536
Marco Mainspring Package No. 1010 – for Seth Thomas 16-size New Style Factory No. ___ - Made in Switzerland
Seth Thomas 16-size Centennial Model 21
Marco Mainspring No. 1010 – for Seth Thomas 16-size New Style Factory No. ___ - Made in Switzerland
Marco Mainspring Package No. 1030 – for Seth Thomas 12-size T end - Made in Switzerland
Seth Thomas 12-size
Marco Mainspring No. 1030 – for Seth Thomas 12-size T end - Made in Switzerland
Marco Mainspring Package No. 1002 – for Seth Thomas 18-size Century, wider, Factory No. 729 - Made in Switzerland
Seth Thomas Century Models 10 & 11
Marco Mainspring No. 1002 – for Seth Thomas 18-size Century, wider, Factory No. 729 - Made in Switzerland