S# 100,221- Model 1874 movement. S# 100,221 is the twenty-first stemwind G Size movement to have been made, and one of only two known Model 1874 movements engraved as being adjusted to isochronism, temperature and positions. It was sold to the NY Office on November 2, 1874 for $145.00, and is the most expensive G Size movement listed anywhere in that section of the factory ledgers. Early G Size movements like this one incorporate a "false plate" under the dial that carries the lower train jewels.
