From 1901 to 1903 Ives listed both a 20 and a 25 windup loco, both were 4-4-0's - the only difference was that the No 25 had a brake, reverse and speed regulator, while the No. 20 had NO REVERSE. According to Doc Robbie the No. 20 always had silver trim and the No. 25 had gold trim. This locomotive has silver trim and does not have a reverse.  See Similar 25.The example below has gold paint around the cab windows but o/w silver trim and no reverse, the brake rods on this one are also straight and not curved up like most.

View of cab showing no reverse.

Another Early 20 this one does have the silver trim.